class Hashable
	hash (self _) -> Size

inst Hashable Size
	hash (self): self

inst Hashable I32
	hash (self _): Mem.u32-size(@cast(self))

inst Hashable U32
	hash (self _): Mem.u32-size(self)

inst Hashable I64
	hash (self _): @cast(self) # not using the normal conversion function, since I don't yet know if they should throw conversion errors or not.

inst Hashable Unit
	hash (_): 0

inst Hashable Char
	hash (c): c
		Char.char-u8()
		Mem.u8-size()