• Enhance OpenAPI walker to visit references.
• Add validation rule regarding the discriminator property
• Correct the handling for the binary and byte data format.
• Process the V2 produces property properly when it is specified in both the document scope and the operation scope, regardless of the order of appearance in the document.
• Fix bugs: duplicate response causing error, null reference issue in a parameter without a schema, null should be allowed as a default when a schema allows nullable, make the writer culture-invariant