Support additional (extra) keywords beyond those specified in the
`Schema` type. The current behavior is additional keywords are dropped.
To follow up:
- There are similar util functions in `mcp/util.go` which don't seem to
be used. Maybe we should move it to `internal/util` instead of
`jsonchema/util.go` package?
- The method `[Un]MarshalJSON` is only on `pointer receiver`, is this
intended? (that means it will only work if we [un]marshal pointer to the
`Schema` instance)
- The fix is using the [un]marshalStructWithMap from `mcp/util.go` and
there are requirements for the function to work properly but these are
not strictly checked e.g. need `json:"-"` tag for the Extra field.
Fixes#69.
bfb9215d16