avro-ts: Sometimes fails to mimic the avsc "auto" setting for wrapped unions

[h0od]

From to the README of avro-ts

Avro Ts attempts to generate the types of the "auto" setting for wrapped unions.

It does this with the following simple logic on these lines of code:

castle/packages/avro-ts/src/types/wrapped-union.ts

Lines 14 to 17 in 192599e

	export const isWrappedUnion = (type: Schema, context: Context): type is WrappedUnionItem[] =>
	isUnion(type) &&
	type.filter((item) => item !== 'null').length > 1 &&
	type.filter((item) => item !== 'null').every((item) => isRecordType(resolveItem(context, item)));

But avsc seem to have a more complex approach as seen here. More specifically in the isAmbiguous() function.

This sometimes leads to failure when trying to encode such message from the types generated by avro-ts