Nitpick: "integer" is not a type that can restrict evaluation

[handrews]

The "primitive types" in §7.6.1 "Assertions and Instance Primitive Types" refers to the types listed in [§4.2.1 "Instance Data Model"]. As noted in the last paragraph of that section, that does not include "integer", which is an invention of the "type" keyword.

Therefore these parts of Keyword can be simplified:

    instance_types: Tuple[str, ...] = "null", "boolean", "integer", "number", "string", "array", "object",

    def can_evaluate(self, instance: JSON) -> bool: 
        if instance.type in self.instance_types:
            return True

        if instance.type == "number" and "integer" in self.instance_types:
            return instance.data == int(instance.data)

        return False