Add support for one-of with any type

[danielbradburn]

This is a rebased version of my original PR rebased on p1c2u/master to get rid of the unnecessary strict validation changes. This pull requests adds support for various cases of oneOf in combination with a SchemaType.ANY schema that currently fail to unmarshal correctly, for example...

Polymorphic:
  oneOf:
    Values:
      type:  array
      items:
        type: string
    Value:
      type: string

[diogobaeder]

Hi,

I think this would fix #127 too, right? My case there involves primitives and list of primitives, but it seems to be acting on the same mechanics.

BTW, the build failed only because of an unused import, if you remove it it should pass :-)

Cheers,
Diogo

[diogobaeder]

@danielbradburn do you still have interest on this pull request? Otherwise I'll use your changes in another pull request I'd like to send, to fix arrays of oneOf.

@p1c2u any chance you can give this some review? This might bring us one step closer to fix a bunch of other issues:
#129
#115
#64

If you want, just add me as a core contributor and I'll take care of those. This issue with arrays of oneOf, in particular, is blocking me with a critical application I'm building at my work.

[danielbradburn]

@danielbradburn do you still have interest on this pull request? Otherwise I'll use your changes in another pull request I'd like to send, to fix arrays of oneOf.

Yes these changes would be very helpful for us. I will make the change to fix the linter, @p1c2u are there any other changes that would be required to get this merged?

[p1c2u]

@danielbradburn fix it and we can merge it

[danielbradburn]

@p1c2u great thanks! I fixed the linter errors now.

[vyakoviv-vs]

Hello. Could anybody please post a working example of the schema with oneOf?
Playing with the 0.11.0, the example at the beginning does not work. My examples does not work neither.
Many Thanks!

openapi-core 0.11.0
openapi-spec-validator 0.2.6