Write `Normalize(pay json.RawMessage, norm Normal, opt Option)(json.RawMessage, error)` if useful

It would be like IsNormal(), except instead of returning bool it would return a normalized structure.

Could probably call other functions like "Canonical". Optionally, may use the suffix "ical"/"ize" for Normal types. "Onlyize, Needize, Orderize, Optionize"

Start by reviewing the existing IsNormal() behavior and the Normal, Option, and json.RawMessage types, then compare any Canonical-style functions. Clarify whether Normalize is needed and settle the naming and normalization contract before implementation; done means the API behavior is defined and verified by tests.

Written by the indexing model from the issue text.