Swagger Conformance

Go to https://editor.swagger.io/

Click File -> Import URL

Enter https://raw.githubusercontent.com/grpc-ecosystem/grpc-gateway/master/examples/proto/examplepb/a_bit_of_everything.swagger.json (current ABE example)

Find some validation errors:

Schema error at paths['/v1/example/a_bit_of_everything/echo/{value}'].get.responses['404']
should NOT have additional properties
additionalProperty: description, schema
Jump to line 63
Schema error at paths['/v1/example/a_bit_of_everything/echo/{value}'].get.responses['404'].schema
should match exactly one schema in oneOf
Jump to line 65
Schema error at paths['/v1/example/a_bit_of_everything/echo/{value}'].get.responses['404'].schema.type
should be equal to one of the allowed values
allowedValues: array, boolean, integer, null, number, object, string, file
Jump to line 66
Semantic error at paths./v1/example/a_bit_of_everything/{uuid}
Equivalent paths are not allowed.
Jump to line 422
Schema error at paths['/v2/example/echo'].get.responses['404']
should NOT have additional properties
additionalProperty: description, schema
Jump to line 689
Schema error at paths['/v2/example/echo'].get.responses['404'].schema
should match exactly one schema in oneOf
Jump to line 691
Schema error at paths['/v2/example/echo'].get.responses['404'].schema.type
should be equal to one of the allowed values
allowedValues: array, boolean, integer, null, number, object, string, file
Jump to line 692
Schema error at paths['/v2/example/echo'].post.responses['404']
should NOT have additional properties
additionalProperty: description, schema
Jump to line 724
Schema error at paths['/v2/example/echo'].post.responses['404'].schema
should match exactly one schema in oneOf
Jump to line 726
Schema error at paths['/v2/example/echo'].post.responses['404'].schema.type
should be equal to one of the allowed values
allowedValues: array, boolean, integer, null, number, object, string, file
Jump to line 727

I wonder, what does their "should" actually mean? If it's a RFC-style "SHOULD", it's not critical.. but it reads like a "real" error though.