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encoding/json: declare hex as a const
hex is in fact immutable, declare it as a const to avoid accidental modification, also for consistency with other packages.
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@ -245,7 +245,7 @@ func (e *MarshalerError) Error() string {
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// Unwrap returns the underlying error.
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func (e *MarshalerError) Unwrap() error { return e.Err }
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var hex = "0123456789abcdef"
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const hex = "0123456789abcdef"
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// An encodeState encodes JSON into a bytes.Buffer.
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type encodeState struct {
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