test: Whenever we test if schemas encode and decode binary correctly, let's automatically test if both the compiled and non-compiled writers work correctly. #2658

Our writers have two paths:

• (if supported) dynamically generated functions that are specialized per schema to write into a buffer
• (fallback) interpreting schemas and dynamically writing to a buffer

The implementation is chosen based on whether compiledIO.ts#EVAL_ALLOWED_IN_ENV is true or not.

Possible solution

We could do this via some sort of expect().toEncodeTo() and expect().toDecodeTo() helpers, or via just helpers that run the calculation twice, make sure the output is the same, and return one of them.

expectEncoded(schema, 123).toMatchInlineSnapshot(...) // writes twice, compares, and returns one of the results