Update

vendor/github.com/go-json-experiment/json/internal/internal.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 package internal
 
 import "errors"
@@ -19,6 +21,7 @@ var AllowInternalUse NotForPublicUse
 var (
 	ErrCycle           = errors.New("encountered a cycle")
 	ErrNonNilReference = errors.New("value must be passed as a non-nil pointer reference")
+	ErrNilInterface    = errors.New("cannot derive concrete type for nil interface with finite type set")
 )
 
 var (

vendor/github.com/go-json-experiment/json/internal/jsonflags/flags.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 // jsonflags implements all the optional boolean flags.
 // These flags are shared across both "json", "jsontext", and "jsonopts".
 package jsonflags
@@ -50,18 +52,20 @@ const (
 		AllowInvalidUTF8 |
 		EscapeForHTML |
 		EscapeForJS |
-		EscapeInvalidUTF8 |
 		PreserveRawStrings |
 		Deterministic |
 		FormatNilMapAsNull |
 		FormatNilSliceAsNull |
 		MatchCaseInsensitiveNames |
 		CallMethodsWithLegacySemantics |
+		FormatByteArrayAsArray |
 		FormatBytesWithLegacySemantics |
-		FormatTimeWithLegacySemantics |
+		FormatDurationAsNano |
 		MatchCaseSensitiveDelimiter |
 		MergeWithLegacySemantics |
-		OmitEmptyWithLegacyDefinition |
+		OmitEmptyWithLegacySemantics |
+		ParseBytesWithLooseRFC4648 |
+		ParseTimeWithLooseRFC3339 |
 		ReportErrorsWithLegacySemantics |
 		StringifyWithLegacySemantics |
 		UnmarshalArrayFromAnyLength
@@ -75,7 +79,7 @@ const (
 	WhitespaceFlags = AnyWhitespace | Indent | IndentPrefix
 
 	// AnyEscape is the set of flags related to escaping in a JSON string.
-	AnyEscape = EscapeForHTML | EscapeForJS | EscapeInvalidUTF8
+	AnyEscape = EscapeForHTML | EscapeForJS
 
 	// CanonicalizeNumbers is the set of flags related to raw number canonicalization.
 	CanonicalizeNumbers = CanonicalizeRawInts | CanonicalizeRawFloats
@@ -95,7 +99,6 @@ const (
 	ReorderRawObjects     // encode only
 	EscapeForHTML         // encode only
 	EscapeForJS           // encode only
-	EscapeInvalidUTF8     // encode only; only exposed in v1
 	Multiline             // encode only
 	SpaceAfterColon       // encode only
 	SpaceAfterComma       // encode only
@@ -130,11 +133,14 @@ const (
 	_ Bools = (maxArshalV2Flag >> 1) << iota
 
 	CallMethodsWithLegacySemantics  // marshal or unmarshal
+	FormatByteArrayAsArray          // marshal or unmarshal
 	FormatBytesWithLegacySemantics  // marshal or unmarshal
-	FormatTimeWithLegacySemantics   // marshal or unmarshal
+	FormatDurationAsNano            // marshal or unmarshal
 	MatchCaseSensitiveDelimiter     // marshal or unmarshal
 	MergeWithLegacySemantics        // unmarshal
-	OmitEmptyWithLegacyDefinition   // marshal
+	OmitEmptyWithLegacySemantics    // marshal
+	ParseBytesWithLooseRFC4648      // unmarshal
+	ParseTimeWithLooseRFC3339       // unmarshal
 	ReportErrorsWithLegacySemantics // marshal or unmarshal
 	StringifyWithLegacySemantics    // marshal or unmarshal
 	StringifyBoolsAndStrings        // marshal or unmarshal; for internal use by jsonv2.makeStructArshaler
@@ -144,6 +150,12 @@ const (
 	maxArshalV1Flag
 )
 
+// bitsUsed is the number of bits used in the 64-bit boolean flags
+const bitsUsed = 42
+
+// Static compile check that bitsUsed and maxArshalV1Flag are in sync.
+const _ = uint64((1<<bitsUsed)-maxArshalV1Flag) + uint64(maxArshalV1Flag-(1<<bitsUsed))
+
 // Flags is a set of boolean flags.
 // If the presence bit is zero, then the value bit must also be zero.
 // The least-significant bit of both fields is always zero.

vendor/github.com/go-json-experiment/json/internal/jsonopts/options.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 package jsonopts
 
 import (
@@ -63,7 +65,7 @@ func (*Struct) JSONOptions(internal.NotForPublicUse) {}
 
 // GetUnknownOption is injected by the "json" package to handle Options
 // declared in that package so that "jsonopts" can handle them.
-var GetUnknownOption = func(*Struct, Options) (any, bool) { panic("unknown option") }
+var GetUnknownOption = func(Struct, Options) (any, bool) { panic("unknown option") }
 
 func GetOption[T any](opts Options, setter func(T) Options) (T, bool) {
 	// Collapse the options to *Struct to simplify lookup.
@@ -102,14 +104,14 @@ func GetOption[T any](opts Options, setter func(T) Options) (T, bool) {
 		}
 		return any(structOpts.DepthLimit).(T), true
 	default:
-		v, ok := GetUnknownOption(structOpts, opt)
+		v, ok := GetUnknownOption(*structOpts, opt)
 		return v.(T), ok
 	}
 }
 
 // JoinUnknownOption is injected by the "json" package to handle Options
 // declared in that package so that "jsonopts" can handle them.
-var JoinUnknownOption = func(*Struct, Options) { panic("unknown option") }
+var JoinUnknownOption = func(Struct, Options) Struct { panic("unknown option") }
 
 func (dst *Struct) Join(srcs ...Options) {
 	dst.join(false, srcs...)
@@ -180,7 +182,7 @@ func (dst *Struct) join(excludeCoderOptions bool, srcs ...Options) {
 				}
 			}
 		default:
-			JoinUnknownOption(dst, src)
+			*dst = JoinUnknownOption(*dst, src)
 		}
 	}
 }

vendor/github.com/go-json-experiment/json/internal/jsonwire/decode.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 package jsonwire
 
 import (

vendor/github.com/go-json-experiment/json/internal/jsonwire/encode.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 package jsonwire
 
 import (
@@ -90,11 +92,7 @@ func AppendQuote[Bytes ~[]byte | ~string](dst []byte, src Bytes, flags *jsonflag
 			case isInvalidUTF8(r, rn):
 				hasInvalidUTF8 = true
 				dst = append(dst, src[i:n-rn]...)
-				if flags.Get(jsonflags.EscapeInvalidUTF8) {
-					dst = append(dst, `\ufffd`...)
-				} else {
-					dst = append(dst, "\ufffd"...)
-				}
+				dst = append(dst, "\ufffd"...)
 				i = n
 			case (r == '\u2028' || r == '\u2029') && flags.Get(jsonflags.EscapeForJS):
 				dst = append(dst, src[i:n-rn]...)

vendor/github.com/go-json-experiment/json/internal/jsonwire/wire.go

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !goexperiment.jsonv2 || !go1.25
+
 // Package jsonwire implements stateless functionality for handling JSON text.
 package jsonwire