Union types appear not to work as expected.

Example:

interface A {
   a: number
}

interface B {
   b: string
}

type C = A | B;

const aSchema: toZod<A> = z.object({a: z.number()})
const bSchema: toZod<B> = z.object({b: z.string()})
const cSchema: toZod<C> = z.union([aSchema, bSchema]) //Error here

The above code causes this error:

Type 'ZodUnion<[ZodObject<{ a: ZodNumber; }, "passthrough", ZodTypeAny, A, A>, ZodObject<{ b: ZodString; }, "passthrough", ZodTypeAny, B, B>]>' is missing the following properties from type 'ZodObject<{ a: ZodNumber; } | { b: ZodString; }, "passthrough", ZodTypeAny, C, C>': _shape, _unknownKeys, _catchall, shape, and 15 more. ts(2740)

Is there a workaround for this? And is there any plan to support this kind of code in the future?