Muse Glimmer: 30B-parameter model optimized for coding agents?

This is very different from Python, where training data is polluted (I presume) with tons of code written by non-software engineers and demonstrating many different ways of doing the same sort of typesetting. So without sandbox: it doesn't apply. What is the best language to have high quality correctness oracles so that the user doesn't have to babysit the LLM and do lots of manual testing?