Method map

ark/type/variants/object.ts:118–118

(
		// v isn't used directly here but helps TS infer a precise type for transformed
		flatMapEntry: (entry: typePropOf<t, $>) => transformed
	)

	partial(): Type<{ [k in keyof t]?: t[k] }, $>

	map<
		transformed extends listable<MappedTypeProp>,
		r = Type<constructMapped<t, transformed>, $>
	>(