The scout source is a Show HN post for zerodecimal, a Go fixed-point decimal library that claims zero allocations, no big.Int fallback, reciprocal division by powers of ten, differential checks, fuzz targets, and committed benchmark comparisons.
The Engineering Problem
Decimal arithmetic is a bad place for casual generated code: overflow, rounding, parsing, formatting, SQL/JSON codecs, and performance shortcuts can all lie quietly. Zerodecimal's interesting move is to make those lies harder to survive the test suite.
The Repo Evidence
The README points to allocation gates, crosschecks, fuzz targets, and benchmark files. div10.go explains the reciprocal-division path, while tables_test.go re-proves generated constants against big.Int.
The Building Skill
The transferable skill is not "let an agent write hard code." It is to make generated hard code prove its own invariants: exact allocation counts, independent table recomputation, differential arithmetic checks, fuzz corpora, and benchmark methodology in the same repo.
What To Inspect Next
The caveat is that committed benchmarks are not independent certification, and the repo has low adoption today. A constructive question for the builder: which proofs would fail first if another contributor changed the reciprocal table or rounding path?