fix(formatter): single-member intersection/union type with comment formatting by Leonabcd123 · Pull Request #21915 · oxc-project/oxc

Leonabcd123 · 2026-04-28T17:13:11Z

Fixes #21914, Fixes #21792, Supersedes #21824.

Tests for union type are taken from #21824.

Comment printing

Changes to comment printing for single member union/intersection types try to mimic:

https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L183-L190

Where own-line comments are leading, and:

https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L200-L206

Where end-of-line comments are trailing (note that this doesn't apply to block comments, see https://github.com/prettier/prettier/blob/870b6df76058cc6c1c23418524d0272141c50677/src/language-js/comments/handle-comments.js#L764), and:

https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L324-L328

Where inline comments are leading if they're separated only by whitespace, open parentheses or other comments from the node after them. Because of that, current behavior is to consider inline comments trailing if they're before the & or | symbol (as they can't be leading, because & and | aren't whitespace).

codspeed-hq · 2026-04-28T17:18:43Z

Merging this PR will not alter performance

✅ 52 untouched benchmarks
⏩ 19 skipped benchmarks¹

_{Comparing Leonabcd123:fix/intersection-type-comment (1b7d903) with main (54d7f75)}

19 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

Leonabcd123 · 2026-05-23T16:25:22Z

Hi @leaysgur,

I got stuck on a case, I'm hoping you can help me here:

For the following case (playground):

export type myType = /* Comment */ // Comment
& "VALUE";

Prettier outputs the following:

export type myType = // Comment
  /* Comment */ "VALUE";

And oxc (both on this pr and on master) output the following:

export type myType /* Comment */ = // Comment
  "VALUE";

Prettier treats the block comment as a leading comment for the intersection type, and the line comment as a trailing comment for the TSTypeAliasDeclaration, which makes them switch in order placement.

The problem I'm having is that when I modify the code so it formats the line comment as a trailing comment, it actually makes the block comment be considered printed. This is because of the order that we print the comments in: we first print trailing comments for the TSTypeAliasDeclaration, and then print the leading comments for the intersection type. This means that when we format the line comment, we increment the printed count by one, making the first comment (which is the block comment, which still hasn't been printed as leading comment) be considered printed. Do you know of a way I can print the second comment before I print the first one?

TLDR: Is there any way to print a comment that comes later in the file before printing one that comes earlier?

Edit: feel free to mark as draft, I'm just not sure how to proceed.

leaysgur · 2026-06-19T00:31:22Z

Sorry for the delay in responding. I guess because it was in draft status, I didn't notice the mention... 🙇🏻

I'll check the current status and get back to you with some feedback.

leaysgur · 2026-06-19T06:47:50Z

I think it's safe to assume the issue where the comment order gets swapped is a bug in Prettier. (I don't recall the details, but I've seen we discussed elsewhere before.)

Aside from that, is there anything else you're concerned about?

Leonabcd123 · 2026-06-19T08:45:49Z

I think it's safe to assume the issue where the comment order gets swapped is a bug in Prettier. (I don't recall the details, but I've seen we discussed elsewhere before.)

Aside from that, is there anything else you're concerned about?

There's the case named mType in the tests which has incorrect semicolon placement, but it's unrelated to the changes and has been reported in #23110. Other than that, everything else seems to work fine.

leaysgur

Thank you so much for your long-hard work on this!

I've left one (nits) comment, but we'll be good to go. 👌🏻

(To be honest, I think there's still room for improvement in the Prettier output too, but fine for now.)

leaysgur · 2026-06-22T01:22:30Z

Thank you~ 🚀

leaysgur · 2026-06-22T01:37:03Z

NOTE: ecosystem-ci trigger does not run on forked PR.

✅: https://github.com/oxc-project/oxc-ecosystem-ci/actions/runs/27924084532

# Oxlint ### 💥 BREAKING CHANGES - 36009dd allocator: [**BREAKING**] `GetAllocator::allocator` take `&self` (#23676) (overlookmotel) ### 🚀 Features - ff65285 linter: `no-restricted-globals` add missing upstream options (#23663) (Sysix) - 7b8bd89 linter/typescript: Implement suggestion for `no-unnecessary-type-constraint` rule (#23646) (Mikhail Baev) - 0dc2405 linter: Add schema for `eslint/no-restricted-properties` (#23619) (Sysix) - b638d0e linter: Add schema for `node/callback-return` (#23615) (Sysix) - eb8bedc linter: Add schema for `import/extensions` (#23557) (WaterWhisperer) - 46f3625 linter: Implement node/no-sync rule (#23589) (fujitani sora) - b01739a linter: Add schema for `unicorn/numeric-separators-style` (#23554) (Mikhail Baev) - 68afd2a linter/node: Implement `no-mixed-requires` rule (#23539) (fujitani sora) - 59d8893 linter: `unicorn/numeric-separators-style` support missing options (#23524) (Sysix) - a421215 linter: Add schema for `eslint/prefer-destructuring` (#23410) (WaterWhisperer) - 84438be linter/jsdoc: Added missing options to `require-param-description` (#23416) (kapobajza) - c145b72 linter/jsdoc/require-param-type: Implement fixer (#23513) (camc314) - 51910df linter/jsdoc: Add missing options to `require-param-type` rule (#23418) (kapobajza) - e90925f linter/unicorn: Implement prefer-number-coercion rule (#23497) (Shekhu☺️) - dd1c866 linter/vue: Implement no-async-in-computed-properties rule (#23493) (bab) - b02444e linter: Add schema for `react/jsx-no-script-url` (#23475) (WaterWhisperer) - 53509a8 minifier: Treeshake pure typed arrays and Set/Map array literals (#23469) (Dunqing) - a8dce46 linter/unicorn: Implement `max-nested-calls` rule (#23461) (arieleli01212) ### 🐛 Bug Fixes - b1948a1 linter/radix: Avoid panic on `parseInt` with a spread radix argument (#23623) (Jerry Zhao) - f28ccfd linter/prefer-query-selector: Use a compound selector for multiple classes (#23628) (Jerry Zhao) - 13f2970 linter/prefer-numeric-literals: Avoid panic on `parseInt` with a spread radix argument (#23624) (Jerry Zhao) - 57612b3 linter: Report invalid capitalized-comments ignore patterns (#23608) (camc314) - 800ee2a linter/consistent-vitest-vi: Preserve import aliases when rewriting the import (#23568) (Yunfei He) - f78b5e1 linter/consistent-indexed-object-style: Don't leak a stray comma into the value type (#23566) (Yunfei He) - 6b104e8 linter/radix: Detect a trailing comma only after the argument (#23569) (Yunfei He) - 2de20cb linter/unicorn/prefer-at: Correct two-argument `slice().pop()` index (#23565) (Yunfei He) - de778ec linter: `unicorn/numeric-separators-style` preserve dot for floats without decial part (#23553) (Sysix) - 651027c linter/curly: Remove only the block's own braces (#23580) (Yunfei He) - 687e835 linter/array-type: Parenthesize a conditional-type element (#23579) (Yunfei He) - 9c80dff linter/unicorn/no-unnecessary-await: Don't paste operators into invalid syntax (#23556) (Yunfei He) - 46e1463 linter/no-compare-neg-zero: Delete the `-` of a parenthesized `-0` (#23578) (Yunfei He) - d172a97 linter/unicorn/prefer-math-trunk: Skip fixer for LHS with side effects (#23548) (camc314) - 1c3a9bd linter/unicorn/prefer-negative-index: Don't report `Array#with` (#23518) (Yunfei He) - c17db5d linter/unicorn/prefer-spread: Don't report `.slice()` on non-array receivers (#23520) (Yunfei He) - 9cd0c2f linter/unicorn/prefer-date-now: Keep `BigInt` wrapper when fixing `BigInt(new Date())` (#23523) (Yunfei He) - 16bb890 linter/unicorn/prefer-array-flat: Skip non-array `flatMap` receivers (#23527) (Yunfei He) - 3e6f90f linter/unicorn/no-zero-fractions: Insert a space after any preceding keyword (#23529) (Yunfei He) - 79a7d69 linter/eslint/no-useless-assignment: Handle exceptional control-flow paths (#23544) (camc314) - e8e2741 linter/unicorn/prefer-math-min-max: Preserve operand source text in the fix (#23533) (Yunfei He) - f592154 linter/react/display-name: Ignore lowercase jsx helpers (#23510) (camc314) - df7612f linter/jsx-a11y/no-noninteractive-element-to-interactive-role: Allow custom roles config (#23507) (camc314) - 924b931 linter/unicorn/prefer-at: Handle checking all indexes correctly (#23504) (camc314) - ca9686b linter/unicorn/prefer-at: Report zero indexes (#23503) (camc314) - e96a4e3 linter/unicorn/explicit-length-check: Ignore optional chains (#23487) (camc314) - a303c23 linter/jsx-a11y: Align `anchor-is-valid` config with upstream (#23446) (camc314) - f27a6d1 linter: False positives with non `*.setTimeout` call in `no-confusing-set-timeout` (#23444) (camc314) ### ⚡ Performance - 8e0dd65 linter: Emit RuleEnum dispatch match once instead of per timing branch (#23499) (Boshen) - d5c7d99 linter/expect-expect: Avoid recompiling matches on every traversal (#23593) (camc314) - f191520 linter/no-useless-spread: Avoid collecting `Vec` before iterating (#23546) (camc314) - 79340d1 linter: Stream React lifecycle ancestors (#23545) (camc314) - 1923169 linter/eslint/max-classes: Gate rule by rule config threshold (#23509) (camc314) - 3f60de3 linter: Use bucketed dispatch for all files (#23452) (camc314) - 3699971 linter/typescript/no-unnecessary-parameter-property-assignment: Avoid temporary vec allocations (#23492) (camc314) - 4ef0ceb linter/eslint/no-useless-switch-case: Avoid temporary vec allocations (#23489) (camc314) - 2e09dd3 linter: Avoid JSX fragment child collections (#23486) (camc314) - f30a64c linter/oxc/branches-sharing-code: Borrow shared branch suggestion text (#23484) (camc314) - 097a317 linter/eslint/no-control-regex: Retain control regex candidates in place (#23482) (camc314) - b3a093d linter: Reuse rule dispatch buckets (#23450) (camc314) - 9f1a985 oxlint: Start Tokio only for LSP (#23447) (camc314) ### 📚 Documentation - 9e219de linter/plugins: Update usage instruction (#23495) (Tony) - b50bf4d linter: Remove manually written options doc for `eslint/arrow-body-style` (#23490) (Mikhail Baev) # Oxfmt ### 💥 BREAKING CHANGES - 36009dd allocator: [**BREAKING**] `GetAllocator::allocator` take `&self` (#23676) (overlookmotel) ### 🐛 Bug Fixes - f21ed2c formatter_json: Normalize CRLF for suppressed text (#23702) (leaysgur) - 7cd1737 formatter: Normalize CRLF for suppressed text (#23701) (leaysgur) - a36e444 formatter: Member chain panic when tail is merged with comment in dev build (#23698) (leaysgur) - 600d306 formatter: Preserve parens with default export and type cast (#23697) (leaysgur) - 61290f2 formatter: Single-member intersection/union type with comment formatting (#21915) (Leonabcd123) - 5a1b0b4 formatter: Parenthesize a type assertion used as the base of `**` (#23633) (Jerry Zhao) - 91827e2 formatter: Use `Ordering::reverse()` with `order: desc` for idempotency (#23543) (leaysgur) - 8fa7394 formatter_json: Handle wrapped error span (#23472) (leaysgur) - 37a34a1 oxfmt/lsp: Avoid newlines line ending changes (#23463) (Sysix) ### ⚡ Performance - 80f1697 formatter: Avoid arena copy for already-lowercase bigint literals (#23534) (Yunfei He) - 1a40b71 formatter: Avoid arena copy for borrowed numeric-literal text (#23512) (Yunfei He) - 12e4451 formatter: Avoid arena copy for borrowed string-literal text (#23465) (Yunfei He) Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>

…rmatting (#21915) Fixes #21914, Fixes #21792, Supersedes #21824. Tests for union type are taken from #21824. ### Comment printing Changes to comment printing for single member union/intersection types try to mimic: https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L183-L190 Where own-line comments are leading, and: https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L200-L206 Where end-of-line comments are trailing (note that this doesn't apply to block comments, see https://github.com/prettier/prettier/blob/870b6df76058cc6c1c23418524d0272141c50677/src/language-js/comments/handle-comments.js#L764), and: https://github.com/prettier/prettier/blob/f5e3980c3085f6fb2b166c8e3f91e8db317d6eb2/src/main/comments/attach.js#L324-L328 Where inline comments are leading if they're separated only by whitespace, open parentheses or other comments from the node after them. Because of that, current behavior is to consider inline comments trailing if they're before the `&` or `|` symbol (as they can't be leading, because `&` and `|` aren't whitespace). --------- Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com> Co-authored-by: Yuji Sugiura <6259812+leaysgur@users.noreply.github.com>

# Oxlint ### 💥 BREAKING CHANGES - 36009dd allocator: [**BREAKING**] `GetAllocator::allocator` take `&self` (#23676) (overlookmotel) ### 🚀 Features - ff65285 linter: `no-restricted-globals` add missing upstream options (#23663) (Sysix) - 7b8bd89 linter/typescript: Implement suggestion for `no-unnecessary-type-constraint` rule (#23646) (Mikhail Baev) - 0dc2405 linter: Add schema for `eslint/no-restricted-properties` (#23619) (Sysix) - b638d0e linter: Add schema for `node/callback-return` (#23615) (Sysix) - eb8bedc linter: Add schema for `import/extensions` (#23557) (WaterWhisperer) - 46f3625 linter: Implement node/no-sync rule (#23589) (fujitani sora) - b01739a linter: Add schema for `unicorn/numeric-separators-style` (#23554) (Mikhail Baev) - 68afd2a linter/node: Implement `no-mixed-requires` rule (#23539) (fujitani sora) - 59d8893 linter: `unicorn/numeric-separators-style` support missing options (#23524) (Sysix) - a421215 linter: Add schema for `eslint/prefer-destructuring` (#23410) (WaterWhisperer) - 84438be linter/jsdoc: Added missing options to `require-param-description` (#23416) (kapobajza) - c145b72 linter/jsdoc/require-param-type: Implement fixer (#23513) (camc314) - 51910df linter/jsdoc: Add missing options to `require-param-type` rule (#23418) (kapobajza) - e90925f linter/unicorn: Implement prefer-number-coercion rule (#23497) (Shekhu☺️) - dd1c866 linter/vue: Implement no-async-in-computed-properties rule (#23493) (bab) - b02444e linter: Add schema for `react/jsx-no-script-url` (#23475) (WaterWhisperer) - 53509a8 minifier: Treeshake pure typed arrays and Set/Map array literals (#23469) (Dunqing) - a8dce46 linter/unicorn: Implement `max-nested-calls` rule (#23461) (arieleli01212) ### 🐛 Bug Fixes - b1948a1 linter/radix: Avoid panic on `parseInt` with a spread radix argument (#23623) (Jerry Zhao) - f28ccfd linter/prefer-query-selector: Use a compound selector for multiple classes (#23628) (Jerry Zhao) - 13f2970 linter/prefer-numeric-literals: Avoid panic on `parseInt` with a spread radix argument (#23624) (Jerry Zhao) - 57612b3 linter: Report invalid capitalized-comments ignore patterns (#23608) (camc314) - 800ee2a linter/consistent-vitest-vi: Preserve import aliases when rewriting the import (#23568) (Yunfei He) - f78b5e1 linter/consistent-indexed-object-style: Don't leak a stray comma into the value type (#23566) (Yunfei He) - 6b104e8 linter/radix: Detect a trailing comma only after the argument (#23569) (Yunfei He) - 2de20cb linter/unicorn/prefer-at: Correct two-argument `slice().pop()` index (#23565) (Yunfei He) - de778ec linter: `unicorn/numeric-separators-style` preserve dot for floats without decial part (#23553) (Sysix) - 651027c linter/curly: Remove only the block's own braces (#23580) (Yunfei He) - 687e835 linter/array-type: Parenthesize a conditional-type element (#23579) (Yunfei He) - 9c80dff linter/unicorn/no-unnecessary-await: Don't paste operators into invalid syntax (#23556) (Yunfei He) - 46e1463 linter/no-compare-neg-zero: Delete the `-` of a parenthesized `-0` (#23578) (Yunfei He) - d172a97 linter/unicorn/prefer-math-trunk: Skip fixer for LHS with side effects (#23548) (camc314) - 1c3a9bd linter/unicorn/prefer-negative-index: Don't report `Array#with` (#23518) (Yunfei He) - c17db5d linter/unicorn/prefer-spread: Don't report `.slice()` on non-array receivers (#23520) (Yunfei He) - 9cd0c2f linter/unicorn/prefer-date-now: Keep `BigInt` wrapper when fixing `BigInt(new Date())` (#23523) (Yunfei He) - 16bb890 linter/unicorn/prefer-array-flat: Skip non-array `flatMap` receivers (#23527) (Yunfei He) - 3e6f90f linter/unicorn/no-zero-fractions: Insert a space after any preceding keyword (#23529) (Yunfei He) - 79a7d69 linter/eslint/no-useless-assignment: Handle exceptional control-flow paths (#23544) (camc314) - e8e2741 linter/unicorn/prefer-math-min-max: Preserve operand source text in the fix (#23533) (Yunfei He) - f592154 linter/react/display-name: Ignore lowercase jsx helpers (#23510) (camc314) - df7612f linter/jsx-a11y/no-noninteractive-element-to-interactive-role: Allow custom roles config (#23507) (camc314) - 924b931 linter/unicorn/prefer-at: Handle checking all indexes correctly (#23504) (camc314) - ca9686b linter/unicorn/prefer-at: Report zero indexes (#23503) (camc314) - e96a4e3 linter/unicorn/explicit-length-check: Ignore optional chains (#23487) (camc314) - a303c23 linter/jsx-a11y: Align `anchor-is-valid` config with upstream (#23446) (camc314) - f27a6d1 linter: False positives with non `*.setTimeout` call in `no-confusing-set-timeout` (#23444) (camc314) ### ⚡ Performance - 8e0dd65 linter: Emit RuleEnum dispatch match once instead of per timing branch (#23499) (Boshen) - d5c7d99 linter/expect-expect: Avoid recompiling matches on every traversal (#23593) (camc314) - f191520 linter/no-useless-spread: Avoid collecting `Vec` before iterating (#23546) (camc314) - 79340d1 linter: Stream React lifecycle ancestors (#23545) (camc314) - 1923169 linter/eslint/max-classes: Gate rule by rule config threshold (#23509) (camc314) - 3f60de3 linter: Use bucketed dispatch for all files (#23452) (camc314) - 3699971 linter/typescript/no-unnecessary-parameter-property-assignment: Avoid temporary vec allocations (#23492) (camc314) - 4ef0ceb linter/eslint/no-useless-switch-case: Avoid temporary vec allocations (#23489) (camc314) - 2e09dd3 linter: Avoid JSX fragment child collections (#23486) (camc314) - f30a64c linter/oxc/branches-sharing-code: Borrow shared branch suggestion text (#23484) (camc314) - 097a317 linter/eslint/no-control-regex: Retain control regex candidates in place (#23482) (camc314) - b3a093d linter: Reuse rule dispatch buckets (#23450) (camc314) - 9f1a985 oxlint: Start Tokio only for LSP (#23447) (camc314) ### 📚 Documentation - 9e219de linter/plugins: Update usage instruction (#23495) (Tony) - b50bf4d linter: Remove manually written options doc for `eslint/arrow-body-style` (#23490) (Mikhail Baev) # Oxfmt ### 💥 BREAKING CHANGES - 36009dd allocator: [**BREAKING**] `GetAllocator::allocator` take `&self` (#23676) (overlookmotel) ### 🐛 Bug Fixes - f21ed2c formatter_json: Normalize CRLF for suppressed text (#23702) (leaysgur) - 7cd1737 formatter: Normalize CRLF for suppressed text (#23701) (leaysgur) - a36e444 formatter: Member chain panic when tail is merged with comment in dev build (#23698) (leaysgur) - 600d306 formatter: Preserve parens with default export and type cast (#23697) (leaysgur) - 61290f2 formatter: Single-member intersection/union type with comment formatting (#21915) (Leonabcd123) - 5a1b0b4 formatter: Parenthesize a type assertion used as the base of `**` (#23633) (Jerry Zhao) - 91827e2 formatter: Use `Ordering::reverse()` with `order: desc` for idempotency (#23543) (leaysgur) - 8fa7394 formatter_json: Handle wrapped error span (#23472) (leaysgur) - 37a34a1 oxfmt/lsp: Avoid newlines line ending changes (#23463) (Sysix) ### ⚡ Performance - 80f1697 formatter: Avoid arena copy for already-lowercase bigint literals (#23534) (Yunfei He) - 1a40b71 formatter: Avoid arena copy for borrowed numeric-literal text (#23512) (Yunfei He) - 12e4451 formatter: Avoid arena copy for borrowed string-literal text (#23465) (Yunfei He) Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>

Leonabcd123 added 4 commits April 28, 2026 19:53

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Leonabcd123 requested review from Dunqing and leaysgur as code owners April 28, 2026 17:13

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Leonabcd123 marked this pull request as draft April 28, 2026 17:34

Leonabcd123 force-pushed the fix/intersection-type-comment branch from 0c44557 to 0aeff8c Compare April 28, 2026 18:04

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leaysgur changed the title ~~fix(oxfmt): single-member intersection type with comment~~ fix(formatter): single-member intersection type with comment Apr 30, 2026

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Merge branch 'main' into fix/intersection-type-comment

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Comment thread crates/oxc_formatter/src/utils/assignment_like.rs

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Merge branch 'main' into fix/intersection-type-comment

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leaysgur merged commit 61290f2 into oxc-project:main Jun 22, 2026
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fix(formatter): handle same-line comment after pipe in single-member union types #21824

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release(apps): oxlint v1.71.0 && oxfmt v0.56.0 #23707

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fix(formatter): single-member intersection/union type with comment formatting#21915

fix(formatter): single-member intersection/union type with comment formatting#21915
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Leonabcd123 commented Apr 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Comment printing

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codspeed-hq Bot commented Apr 28, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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leaysgur commented Jun 22, 2026

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Leonabcd123 commented Apr 28, 2026 •

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