Support complex and big numeric types?

[theory]

The implementation currently supports all of Go's core numeric types for comparison and truthiness except for complex64 and complex128. And as of #14 it also supports json.Numbers.

Should it also support complex64 and complex128? What about big.Int, big.Float, and big.Rat? Are those likely to be parsed from JSON? encoding/json does not, but perhaps other JSON parsers?

Is there a need to support these types?