Fix identification of 'int-or-string' type attributes

[alexsomesan]

Description

int-or-string types can also be defined by aggregated APIs, as 3rd party types.
Both built-in and 3rd party int-or-string types have a signature value of int-or-string in the format attribute.

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

Fixes #1627

Community Note

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