oas2PolymorphicOneOf
oas2PolymorphicOneOf will check a specification to ensure that if it’s a Swagger specification (OpenAPI 2.0), then
it has not made use of oneOf.
Example ruleset configuration
oas2-oneOf:
description: "Check for invalid use of 'oneOf'"
type: "validation"
recommended: true
severity: "err"
given: "$"
then:
function: "oas2PolymorphicOneOf"
The function is used by the oas2-oneOf Rule