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encoder_test.go (1)

474-476: Tests: solid migration to reflect.TypeAssert; consider asserting the ok for clearer failures.

Using reflect.TypeAssert in tests removes Interface() allocations and mirrors production paths. For even clearer diagnostics when a registration accidentally passes the wrong type, consider checking ok and failing fast with a descriptive message (small nit, since these sites are expected to succeed).

Example pattern you can apply to these sites:

- tv, _ := reflect.TypeAssert[time.Time](value)
- return tv.Format(time.RFC3339Nano)
+ if tv, ok := reflect.TypeAssert[time.Time](value); ok {
+   return tv.Format(time.RFC3339Nano)
+ }
+ t.Fatalf("internal: expected time.Time, got %v", value.Type())
+ return ""

And similarly for:

• line 525: *CustomTime
• lines 549/580/786: time.Duration
• lines 736/762: time.Time

Note: reflect.TypeAssert is available starting in Go 1.25. (tip.golang.org)

Also applies to: 525-526, 549-552, 580-583, 736-738, 762-764, 786-788

decoder.go (2)

496-498: Use the ok result from TypeAssert to avoid a potential nil-interface method call.

In the unlikely event m.IsValid is out of sync with the actual value, um would be a typed-nil interface and calling UnmarshalText would panic. Guarding with ok provides a safer, clearer error.

Apply:

-        um, _ := reflect.TypeAssert[encoding.TextUnmarshaler](u)
-        if err := um.UnmarshalText([]byte(value)); err != nil {
+        um, ok := reflect.TypeAssert[encoding.TextUnmarshaler](u)
+        if !ok {
+          return ConversionError{
+            Key:   path, Type: t, Index: key,
+            Err:   fmt.Errorf("expected %v to implement encoding.TextUnmarshaler", u.Type()),
+          }
+        }
+        if err := um.UnmarshalText([]byte(value)); err != nil {

---

579-581: Mirror the TypeAssert ok check on the non-slice path for consistency and safety.

Same reasoning as above; this avoids a panic path and returns a structured ConversionError instead.

-        um, _ := reflect.TypeAssert[encoding.TextUnmarshaler](u)
-        if err := um.UnmarshalText([]byte(val)); err != nil {
+        if um, ok := reflect.TypeAssert[encoding.TextUnmarshaler](u); ok {
+          if err := um.UnmarshalText([]byte(val)); err != nil {
             return ConversionError{
               Key:   path,
               Type:  t,
               Index: -1,
               Err:   err,
             }
-        }
+          }
+        } else {
+          return ConversionError{
+            Key:   path, Type: t, Index: -1,
+            Err:   fmt.Errorf("expected %v to implement encoding.TextUnmarshaler", u.Type()),
+          }
+        }

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Learnt from: sixcolors
PR: gofiber/fiber#2922
File: middleware/cors/utils.go:63-71
Timestamp: 2024-07-26T21:00:12.902Z
Learning: The project uses the testify/assert package for assertions in unit tests.

Learnt from: sixcolors
PR: gofiber/fiber#2922
File: middleware/cors/utils.go:63-71
Timestamp: 2024-10-08T19:06:06.583Z
Learning: The project uses the testify/assert package for assertions in unit tests.

Learnt from: luk3skyw4lker
PR: gofiber/storage#1342
File: clickhouse/clickhouse.go:106-107
Timestamp: 2024-07-01T15:49:51.308Z
Learning: The `IsZero` function for `time.Time` structs in the ClickHouse storage driver was returning false even for zero value `time.Time` structs. As a result, a different verification logic was implemented to avoid bugs.

encoder.go (1)

64-65: Please verify Go version enforcement

I wasn’t able to locate any go.mod or go.work file in the repository, nor any GitHub Actions workflows under .github/workflows, so it’s unclear whether CI or local builds are pinned to Go 1.25 or newer. Before merging, please confirm that:

• A go.mod or go.work at the project root specifies go 1.25 (or higher).
• All CI pipelines (e.g. GitHub Actions, other runners) are configured to use Go 1.25+.

This ensures the use of reflect.TypeAssert (introduced in Go 1.25) will work reliably both locally and on CI.

decoder.go (1)

625-626: LGTM: centralizing interface checks on reflect.TypeAssert reduces allocations and simplifies isTextUnmarshaler.

This refactor is faithful to the original logic while leveraging the new stdlib helper; it should be a net win for hot decode paths that hit TextUnmarshaler frequently. (tip.golang.org)

Also applies to: 632-632, 644-644, 654-654, 660-660

Critical Problems:

1. Go 1.25 does not exist - As of January 2025, the latest stable Go version is 1.24. The version specified throughout this PR is invalid.
2. reflect.TypeAssert is not a real function - The Go standard library's reflect package does not contain a TypeAssert function. This appears to be either a misunderstanding or an assumption about a future API that doesn't exist.
3. Code will not compile - All changes using reflect.TypeAssert will result in compilation errors.

This PR cannot be merged in its current state and requires a complete revision of the approach.