When the handler itself is non-serializable, path in the error misses one key

[girvel]

Example:

ldump does not support serializing type "userdata" of ._entities.table: 0x73f72e862ac8.sprite.image.<upvalue args>.1; use `__serialize` metamethod or `ldump.serializer.handlers` to define serialization

It says ._entities.table: 0x73f72e862ac8.sprite.image.<upvalue args>.1 when it should be saying something like ._entities.table: 0x73f72e862ac8.sprite.image.<handler>.<upvalue args>.1. <handler> or <serialization function> should do.