Proposal Details

This is a sub-issue of the "encoding/json/v2" proposal (#71497).

I propose adding the following to the encoding/json/jsontext (Switch statement generates longer assembly).

func (k Kind) IsValid() bool {
	return k == 'n' || k == 'f' || k == 't' || k == '"' || k == '0' || k == '{' || k == '}' || k == '[' || k == ']'
}

Rationale

This provides a reliable way to determine whether Kind is valid, because as I learned, this is incorrect.

func (k Kind) IsValid() bool {
	return k != 0
}