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thinking about how best to do type unification for structs in femstache

if i have constraints like fresh a; a ~ { x: bool, y: string }; a ~ { x: bool, z: string }, this should unify as a = { x: bool, y: optional string, z: optional string }

but the first constraint already replaces all occurences of a with { x: bool, y: string } and then the unification { x: bool, y: string } ~ { x: bool, z: string } happens, which succeeds but can't really "change" the shape of the struct

thinking of maybe adding a kind of "type shape" thing where { x: int, y: bool } turns into fresh a; member "x" int a, member "y" bool a => a

hmm