Check how front / py2http serialize an InstanceAttrDefault signature default (methodize default_from) #120

Deferred from #118 (raised in the review of #117). A methodize(..., default_from=...) param's signature default is an InstanceAttrDefault marker (repr self.attr). Code that JSON-serializes signature defaults (front's form generation, py2http's OpenAPI spec; cf. #88/#89 with NotSet) would meet a non-serializable object if it is ever handed a methodized function.

To do: write a test in front and py2http (or here, with a minimal JSON dump of Sig(...).defaults) that feeds a methodized function, and decide whether InstanceAttrDefault should carry a serialization hook (e.g. __json__/to_jsonable) or whether consumers should treat it as "no default".

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