[Python] [Typeguard] Part 4 - Add Typeguard to AIO stack in tests by asheshvidyut · Pull Request #40226 · grpc/grpc

asheshvidyut · 2025-07-16T14:06:40Z

Description

Last Part of Add Typeguard to AIO stack - runs only in tests, fixes type hints for AIO Stack
Change -

Type Annotation Update in Channel Constructor

File: _channel.py (line 330)
Before: credentials: Optional[grpc.ChannelCredentials],
After: credentials: Optional[cygrpc.ChannelCredentials],

Change:
Updated type hint from grpc.ChannelCredentials to cygrpc.ChannelCredentials

Metadata Class Method Enhancement

File: _metadata.py (around line 100-102)
Before: def from_tuple(cls, raw_metadata: tuple):
After: def from_tuple(cls, raw_metadata: Union[tuple, Self]):

`GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY`decode at Cython layer.

File: src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi
Before: GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = ( _GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY)
After: GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = ( _GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY).decode()

Testing

CI

Related Work

Part 1: [Python][Typeguard] Part 1: Add Typeguard to AIO stack in tests #40201
Part 2: [Python][Typeguard] Part 2 - Add Typeguard to AIO stack in tests #40215
Part 3: [Python][Typeguard] Part 3 - Add Typeguard to AIO stack in tests #40217
Part 5: [Python] [Typeguard] Part 5 - Add Typeguard SYNC Stack in tests #40278
b/423755915

asheshvidyut · 2025-07-26T11:14:22Z

@sergiitk as discussed - I am only supressing the test cases which have *invalid* data now.

asheshvidyut · 2025-07-26T12:44:20Z


    def get(
-        self, key: MetadataKey, default: MetadataValue = None
+        self, key: MetadataKey, default: Optional[MetadataValue] = None


Had to change this because some tests were failing with following stack trace

====================================================================== ERROR: test_delete_values (src.python.grpcio_tests.tests_aio.unit._metadata_test.TestTypeMetadata) ---------------------------------------------------------------------- Traceback (most recent call last): File ".src/python/grpcio_tests/tests_aio/unit/_metadata_test.py", line 186, in test_delete_values self.assertEqual(metadata.get("key1"), "other value 1") File ".src/python/grpcio/grpc/aio/_metadata.py", line 104, in get def get( File ".site-packages/typeguard/_functions.py", line 136, in check_argument_types check_type_internal(value, annotation, memo) File ".site-packages/typeguard/_checkers.py", line 779, in check_type_internal checker(value, origin_type, args, memo) File ".site-packages/typeguard/_checkers.py", line 428, in check_union raise TypeCheckError(f"did not match any element in the union:\n{formatted_errors}") typeguard.TypeCheckError: argument "default" (None) did not match any element in the union: str: is not an instance of str bytes: is not bytes-like ====================================================================== ERROR: test_get_item (src.python.grpcio_tests.tests_aio.unit._metadata_test.TestTypeMetadata) ---------------------------------------------------------------------- Traceback (most recent call last): File ".src/python/grpcio_tests/tests_aio/unit/_metadata_test.py", line 118, in test_get_item self.assertEqual(metadata.get("key"), "value1") File ".src/python/grpcio/grpc/aio/_metadata.py", line 104, in get def get( File ".site-packages/typeguard/_functions.py", line 136, in check_argument_types check_type_internal(value, annotation, memo) File ".site-packages/typeguard/_checkers.py", line 779, in check_type_internal checker(value, origin_type, args, memo) File ".site-packages/typeguard/_checkers.py", line 428, in check_union raise TypeCheckError(f"did not match any element in the union:\n{formatted_errors}") typeguard.TypeCheckError: argument "default" (None) did not match any element in the union: str: is not an instance of str bytes: is not bytes-like

Yes, this makes sense.

…part-4

sergiitk · 2026-02-13T00:00:44Z

/gemini review

gemini-code-assist

Code Review

This pull request enables Typeguard for more AIO modules and fixes several type hints. The changes look good, especially the use of @typeguard.suppress_type_checks in tests that intentionally use invalid types. I've found one area for improvement regarding a type hint in _metadata.py that could be made more accurate to reflect the implementation and the author's intent as described in the PR description. I've left a couple of comments with suggestions.

gemini-code-assist · 2026-02-13T00:04:04Z


    def test_metadata_from_tuple(self):
        scenarios = (
-            (None, Metadata()),


This test case for None input should be kept. The from_tuple method can handle None, and its type hint should be updated to Optional[...] to reflect this, as suggested in my other comment. Restoring this test case will ensure None continues to be handled correctly.

sergiitk · 2025-12-09T16:30:44Z

+    @typeguard.suppress_type_checks
    async def test_invalid_client_args(self):
+        # This test works on invalid client_args which is expected
+        # to make typeguard fail, hence the decorator
+        # @typeguard.supress_type_checks is used


here and elsewhere: the comment can be as simple as this, no need for long explanation in the test itself

Suggested change

@typeguard.suppress_type_checks

async def test_invalid_client_args(self):

# This test works on invalid client_args which is expected

# to make typeguard fail, hence the decorator

# @typeguard.supress_type_checks is used

@typeguard.suppress_type_checks # testing negative cases

sergiitk · 2026-02-17T07:14:47Z


    def get(
-        self, key: MetadataKey, default: MetadataValue = None
+        self, key: MetadataKey, default: Optional[MetadataValue] = None


Yes, this makes sense.

sergiitk · 2026-02-17T07:24:37Z

 def compression_algorithm_to_metadata(compression: grpc.Compression):
    return (
-        cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
+        grpc._common.decode(cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY),


For posterity, this fixes

====================================================================== ERROR: test_client_call_level_compression_allowed_compression (src.python.grpcio_tests.tests_aio.unit.compression_test.TestCompression.test_client_call_level_compression_allowed_compression) ---------------------------------------------------------------------- Traceback (most recent call last): File "./src/python/grpcio_tests/tests_aio/unit/_test_base.py", line 31, in wrapper return loop.run_until_complete(f(*args, **kwargs)) ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/local/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete return future.result() ~~~~~~~~~~~~~^^ File "./src/python/grpcio_tests/tests_aio/unit/compression_test.py", line 157, in test_client_call_level_compression_allowed_compression call = multicallable(_REQUEST, compression=grpc.Compression.Deflate) File "./src/python/grpcio/grpc/aio/_channel.py", line 150, in __call__ metadata = self._init_metadata(metadata, compression) File "./src/python/grpcio/grpc/aio/_channel.py", line 131, in _init_metadata metadata = Metadata( *_compression.augment_metadata(metadata, compression) ) File "./src/python/grpcio/grpc/aio/_metadata.py", line 38, in __init__ def __init__(self, *args: Tuple[MetadataKey, MetadataValue]) -> None: ...<2 lines>... self.add(md_key, md_value) File "./site-packages/typeguard/_functions.py", line 137, in check_argument_types check_type_internal(value, annotation, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 951, in check_type_internal checker(value, origin_type, args, memo) ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 384, in check_tuple check_type_internal(element, element_type, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 951, in check_type_internal checker(value, origin_type, args, memo) ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 400, in check_tuple check_type_internal(element, element_type, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 956, in check_type_internal raise TypeCheckError(f"is not an instance of {qualified_name(origin_type)}") typeguard.TypeCheckError: item 0 of item 0 of argument "args" (tuple) is not an instance of str ====================================================================== ERROR: test_client_call_level_compression_baned_compression (src.python.grpcio_tests.tests_aio.unit.compression_test.TestCompression.test_client_call_level_compression_baned_compression) ---------------------------------------------------------------------- Traceback (most recent call last): File "./src/python/grpcio_tests/tests_aio/unit/_test_base.py", line 31, in wrapper return loop.run_until_complete(f(*args, **kwargs)) ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^ File "/opt/local/Library/Frameworks/Python.framework/Versions/3.13/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete return future.result() ~~~~~~~~~~~~~^^ File "./src/python/grpcio_tests/tests_aio/unit/compression_test.py", line 147, in test_client_call_level_compression_baned_compression call = multicallable(_REQUEST, compression=grpc.Compression.Gzip) File "./src/python/grpcio/grpc/aio/_channel.py", line 150, in __call__ metadata = self._init_metadata(metadata, compression) File "./src/python/grpcio/grpc/aio/_channel.py", line 131, in _init_metadata metadata = Metadata( *_compression.augment_metadata(metadata, compression) ) File "./src/python/grpcio/grpc/aio/_metadata.py", line 38, in __init__ def __init__(self, *args: Tuple[MetadataKey, MetadataValue]) -> None: ...<2 lines>... self.add(md_key, md_value) File "./site-packages/typeguard/_functions.py", line 137, in check_argument_types check_type_internal(value, annotation, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 951, in check_type_internal checker(value, origin_type, args, memo) ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 384, in check_tuple check_type_internal(element, element_type, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 951, in check_type_internal checker(value, origin_type, args, memo) ~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 400, in check_tuple check_type_internal(element, element_type, memo) ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "./site-packages/typeguard/_checkers.py", line 956, in check_type_internal raise TypeCheckError(f"is not an instance of {qualified_name(origin_type)}") typeguard.TypeCheckError: item 0 of item 0 of argument "args" (tuple) is not an instance of str ----------------------------------------------------------------------

sergiitk · 2026-02-17T07:43:56Z

 def compression_algorithm_to_metadata(compression: grpc.Compression):
    return (
-        cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
+        grpc._common.decode(cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY),


Looking further into this, I recommend defining GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY as a string in

grpc/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi

Lines 114 to 115 in 456a47b

GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = (

_GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY)

Since we know that a metadata key should never be bytes, we should just do

GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = ( _GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY ).decode()

agree, and IIRC I had looked into this and had a similar comment when I first reviewed this PR too. Sadly, looks like the comment disappeared after the force push. Anyways, we also have a similar situation with cygrpc.ChannelArgKey.primary_user_agent_string as I mentioned here: https://github.com/grpc/grpc/pull/40278/changes#r2247823758

Values coming from Core tend to be char* (equivalent to bytes) which is the cause of this problem. We should convert them to string when we use them in Python

sreenithi · 2026-02-15T16:27:45Z


    @classmethod
-    def from_tuple(cls, raw_metadata: tuple):
+    def from_tuple(cls, raw_metadata: Union[tuple, Self]):


If this function is also accepting a Metadata object, we should probably add a check for the type and return the object itself directly.
The current logic works, but it will be creating a new Metadata object from the given Metadata object, which seems redundant.

This is actually a very good point. Not sure how we missed this. The name of the method is clearly from_tuple. Is there a test how it'll even work with non-empty Metadata object?

Also, Self is misused here:

Special type to represent the current enclosed class.
— https://docs.python.org/3.14/library/typing.html#typing.Self

The main intent for this is to:

Annotate self argument as self: Self

Indicate the method returns self (f.e. in chaining), and require subclasses from returning superclasses.

Indicate abstract factory methods that return cls()

I don't think this was ever intended to be used in arguments.

@asheshvidyut - we should fix this ASAP.

My bad, looked at the spec, and it's OK to use it in params:

https://typing.python.org/en/latest/spec/generics.html#use-in-parameter-types

Looks like I missed the last check you added.

Discussed the plan to address this IRL.

We'll revert raw_metadata type to tuple

We'll going create an internal _create classmethod that will support instantiating Metadata from

None

Metadata (Self)

Iterable[tuple[MetadataKey, MetadataValue]]

Internally, we'll replace all places that violate the original signature def from_tuple(cls, raw_metadata: tuple) to the new _create method

We'll make the method public with the same gRFC where we introduces type hints to the sync stack.

sreenithi · 2026-02-17T08:38:00Z

 def compression_algorithm_to_metadata(compression: grpc.Compression):
    return (
-        cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY,
+        grpc._common.decode(cygrpc.GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY),


agree, and IIRC I had looked into this and had a similar comment when I first reviewed this PR too. Sadly, looks like the comment disappeared after the force push. Anyways, we also have a similar situation with cygrpc.ChannelArgKey.primary_user_agent_string as I mentioned here: https://github.com/grpc/grpc/pull/40278/changes#r2247823758

Values coming from Core tend to be char* (equivalent to bytes) which is the cause of this problem. We should convert them to string when we use them in Python

This PR adds new create method for `aio.Metadata`, as described in the comment here - #40226 (comment) Reason being `from_tuple` as the name says should actually create only from `tuple` whereas the method actually takes other arguments as well. Hence we introduce the new `_create` method, which is internal as of now. Closes #41678 COPYBARA_INTEGRATE_REVIEW=#41678 from asheshvidyut:fix-api c1a0281 PiperOrigin-RevId: 885107284

This PR adds new create method for `aio.Metadata`, as described in the comment here - grpc#40226 (comment) Reason being `from_tuple` as the name says should actually create only from `tuple` whereas the method actually takes other arguments as well. Hence we introduce the new `_create` method, which is internal as of now. Closes grpc#41678 COPYBARA_INTEGRATE_REVIEW=grpc#41678 from asheshvidyut:fix-api c1a0281 PiperOrigin-RevId: 885107284

…pc#40226) ### Description Last Part of Add Typeguard to AIO stack - runs only in tests, fixes type hints for AIO Stack Change - #### Type Annotation Update in Channel Constructor File: _channel.py (line 330) Before: credentials: `Optional[grpc.ChannelCredentials]`, After: credentials: `Optional[cygrpc.ChannelCredentials]`, Change: Updated type hint from `grpc.ChannelCredentials` to `cygrpc.ChannelCredentials` #### Metadata Class Method Enhancement File: _metadata.py (around line 100-102) Before: `def from_tuple(cls, raw_metadata: tuple):` After: `def from_tuple(cls, raw_metadata: Union[tuple, Self]):` #### `GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY`decode at Cython layer. File: src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi Before: `GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = ( _GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY)` After: `GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = ( _GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY).decode()` ### Testing CI ### Related Work - Part 1: grpc#40201 - Part 2: grpc#40215 - Part 3: grpc#40217 - Part 5: grpc#40278 - b/423755915 Closes grpc#40226 COPYBARA_INTEGRATE_REVIEW=grpc#40226 from asheshvidyut:feature/type-hints/typeguard-aio-stack-part-4 70db2d6 PiperOrigin-RevId: 871724432

This PR adds new create method for `aio.Metadata`, as described in the comment here - grpc#40226 (comment) Reason being `from_tuple` as the name says should actually create only from `tuple` whereas the method actually takes other arguments as well. Hence we introduce the new `_create` method, which is internal as of now. Closes grpc#41678 COPYBARA_INTEGRATE_REVIEW=grpc#41678 from asheshvidyut:fix-api c1a0281 PiperOrigin-RevId: 885107284

…1888) Backport of #41678 to v1.80.x. --- This PR adds new create method for `aio.Metadata`, as described in the comment here - #40226 (comment) Reason being `from_tuple` as the name says should actually create only from `tuple` whereas the method actually takes other arguments as well. Hence we introduce the new `_create` method, which is internal as of now. Co-authored-by: Ashesh Vidyut <asheshvidyut@google.com>

This PR adds new create method for `aio.Metadata`, as described in the comment here - grpc#40226 (comment) Reason being `from_tuple` as the name says should actually create only from `tuple` whereas the method actually takes other arguments as well. Hence we introduce the new `_create` method, which is internal as of now. Closes grpc#41678 COPYBARA_INTEGRATE_REVIEW=grpc#41678 from asheshvidyut:fix-api c1a0281 PiperOrigin-RevId: 885107284

### Description First Part of Add Typeguard to SYNC stack - runs only in tests, fixes type hints for SYNC Stack. This has changes from Part 4 #40226 ### Changes TODO ### Testing CI ### Related Work - Part 1: #40201 - Part 2: #40215 - Part 3: #40217 - Part 4: #40226 - Part 6: #40353 - b/423755915 Closes #40278 COPYBARA_INTEGRATE_REVIEW=#40278 from asheshvidyut:feature/type-hints/typeguard-sync-stack-part-1 24987e7 PiperOrigin-RevId: 890732097

…#40278) ### Description First Part of Add Typeguard to SYNC stack - runs only in tests, fixes type hints for SYNC Stack. This has changes from Part 4 grpc#40226 ### Changes TODO ### Testing CI ### Related Work - Part 1: grpc#40201 - Part 2: grpc#40215 - Part 3: grpc#40217 - Part 4: grpc#40226 - Part 6: grpc#40353 - b/423755915 Closes grpc#40278 COPYBARA_INTEGRATE_REVIEW=grpc#40278 from asheshvidyut:feature/type-hints/typeguard-sync-stack-part-1 24987e7 PiperOrigin-RevId: 890732097

github-actions Bot added the lang/Python label Jul 16, 2025

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grpc-checks Bot added bloat/none per-call-memory/neutral per-channel-memory/neutral labels Jul 16, 2025

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asheshvidyut force-pushed the feature/type-hints/typeguard-aio-stack-part-4 branch 2 times, most recently from 26572b0 to c584ba8 Compare July 25, 2025 08:17

asheshvidyut requested review from sergiitk and sreenithi July 25, 2025 09:21

asheshvidyut commented Jul 25, 2025

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asheshvidyut requested review from eugeneo and removed request for eugeneo July 25, 2025 09:49

asheshvidyut marked this pull request as ready for review July 25, 2025 10:49

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asheshvidyut commented Jul 26, 2025

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Comment thread src/python/grpcio/grpc/aio/_call.py Outdated

Comment thread src/python/grpcio/grpc/aio/_channel.py

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Comment thread src/python/grpcio/grpc/aio/_metadata.py Outdated

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asheshvidyut force-pushed the feature/type-hints/typeguard-aio-stack-part-4 branch from 5df8618 to d7cf624 Compare July 28, 2025 04:13

This was referenced Jul 30, 2025

[Python] [Typeguard] Part 5 - Add Typeguard SYNC Stack in tests #40278

Closed

[Python] [Typeguard] Part 6 - Add Typeguard SYNC Stack in tests #40353

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asheshvidyut force-pushed the feature/type-hints/typeguard-aio-stack-part-4 branch from d7cf624 to f67aaa0 Compare July 30, 2025 11:08

asheshvidyut added this to the Python Type Hints Support milestone Aug 7, 2025

asheshvidyut force-pushed the feature/type-hints/typeguard-aio-stack-part-4 branch from f67aaa0 to 7fa0f84 Compare September 16, 2025 16:24

asheshvidyut added 8 commits January 26, 2026 14:33

revert public method name change

fb7bf0a

fixes comment in asheshvidyut:feature/type-hints/typeguard-aio-stack-…

4e9d310

…part-4

removed the print statement

0dbc386

decode

76587bd

resolve comments

82e035d

fix other comments

c4a0dab

black code

d8db97d

fix typo

bbe3bf9

asheshvidyut force-pushed the feature/type-hints/typeguard-aio-stack-part-4 branch from a01f89b to bbe3bf9 Compare January 26, 2026 14:33

asheshvidyut mentioned this pull request Feb 12, 2026

[Python] Typehints generated code #41542

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asheshvidyut added 4 commits February 17, 2026 10:22

update comment

53d754e

add check if already metadata

db6694d

decode in cython layer

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black

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asheshvidyut mentioned this pull request Feb 19, 2026

[Python] New _create method for aio.Metadata #41678

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sergiitk mentioned this pull request Mar 17, 2026

[Backport][v1.80.x][Python] New _create method for aio.Metadata #41888

Merged

	GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY = (
	_GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY)

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asheshvidyut commented Jul 16, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Description

Type Annotation Update in Channel Constructor

Metadata Class Method Enhancement

GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEYdecode at Cython layer.

Testing

Related Work

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asheshvidyut commented Jul 26, 2025

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asheshvidyut commented Jul 16, 2025 •

edited

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`GRPC_COMPRESSION_REQUEST_ALGORITHM_MD_KEY`decode at Cython layer.

asheshvidyut Jul 26, 2025 •

edited by sergiitk

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sergiitk Feb 17, 2026 •

edited

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