[Ruby] RepeatedField#values_at is aliased to Enumerable#select

Summary

Ruby Google::Protobuf::RepeatedField#values_at is currently aliased to Enumerable#select. It therefore expects a block and raises ArgumentError for the index/range arguments required by the Array-like API.

Reproduction

On current main (5b1c20741838b8359193b97895cb0ff35b4ecf79) and 4.36.0, create a typed repeated field containing three values and call values_at(0, -1, 10, 1..2). The call raises instead of returning the corresponding values and nil for the out-of-range index.

Proposed correction

Delegate values_at to to_ary, alongside the other non-mutating Array methods, and remove the incorrect alias. Candidate: c9fc1c901baa2b6ab4d0d48dd1d509f6a30a9708.

The isolated model passes full positive/negative/out-of-range/range semantics. The cumulative candidate passes 332 native tests /556,948 assertions and 329 FFI tests /598,403 assertions with no failures or errors (documented omissions only), plus Songstats schema round-trips.

I used an AI coding assistant during source review and verification. I am opening an issue first because CONTRIBUTING asks for tests and maintainer agreement; this dependency audit is not permitted to modify repository tests and no CLA was signed as part of it.

Locate Ruby's Google::Protobuf::RepeatedField#values_at implementation and the nearby non-mutating Array method delegations. Compare the proposed correction at commit c9fc1c901baa2b6ab4d0d48dd1d509f6a30a9708, then run the native and FFI test suites and the Songstats schema round-trips. Done means index, negative-index, range, and out-of-range behavior works without failures or errors.