ParserError.Offset is now a plain exported int field, always set:
- The parser sets it via setErrOffset() when capturing parse errors
- strict.go sets it from the key's Raw range at construction
- wrapDecodeError computes it inline from cap(document) - cap(highlight)
This eliminates:
- The SetOffset/Offset() accessor methods and offsetValid flag
- The subsliceOffset fallback function in errors.go
- Any conditional logic around whether the offset is present
The offset is guaranteed by construction at every path that creates
or consumes a ParserError.
Co-authored-by: Thomas Pelletier <thomas@pelletier.dev>
Cursor Agent
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