The `integer_types` is always a tuple. When checking
if an instance is a number it fails because it's doing a comparison against a tuple
instead of real type.
➜ python -c "from six import integer_types;import sys;print(integer_types);print(sys.version)"
(<type 'int'>, <type 'long'>)
2.7.16 (default, Apr 6 2019, 01:42:57)
[GCC 8.3.0]
➜ python3 -c "from six import integer_types;import sys;print(integer_types);print(sys.version)"
(<class 'int'>,)
3.7.3 (default, Apr 3 2019, 05:39:12)
[GCC 8.3.0]
And spec defines a number as both int and float https://swagger.io/docs/specification/data-models/data-types/#numbers so both validators need to support both types.
This is important because it does the correct validation over items that
are restricted in "oneOf", so that it's possible to use schemas that are
superset of one another as items of "oneOf".
Before this change, if a UUID instance got received as value in the
Schema, it was breaking the unmarshal because UUID instances can't be
used as values to instantiate other UUIDs.
