tarantool / go-config / 28018888470

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jsonschema: schema-aware null coercion with configurable scalar policy

With ToAny now yielding nil for empty values, validation needs to know
the intended empty shape, which only the schema carries. Add a coercion
pass (coerceNulls) run between ToAny and Validate: it walks the data
alongside the compiled schema (resolving $ref and allOf/anyOf/oneOf) and
rewrites a null into {} where the schema expects an object and [] where
it expects an array. Nullable schemas keep null.

The ambiguous scalar case (string/number/bool) is governed by
NullCoercion: NullLeave (default), NullDrop (treat empty as unset) or
NullZero (typed zero value). Configure it per-validator via
WithNullCoercion, per-build via Builder.WithJSONSchema options or
tarantool.Builder.WithNullCoercion, or globally via DefaultNullCoercion.

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