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zeekayandHanzo Dev
99724b95b2
cloud linked a Rust staticlib (native/flags) over cgo to decide flags. That made every consumer of the flags path a cgo build, needed a prebuilt libhanzo_flags.a on the link line, and put a second language in the release pipeline for one pure function. This is that function in Go, with no dependencies at all — the rollout hash, the full property-operator set, semver ranges, the date operators, and the serde-compatible value rendering the operators compare through. The rollout hash decides which identities fall inside a percentage, so drift would split cohorts differently here than in the rest of the fleet. The port is therefore pinned to the Rust implementation's own answers: testdata/cases.json is a 621-case table covering every operator, eight rollout percentages against forty identities each, multivariate bucketing, group aggregation and the numeric/escaping edges; testdata/oracle.json is what the Rust evaluator returned for all of them; parity_test.go asserts this package still agrees. Four deliberate mutations confirm the table has teeth: shifting the hash by one bit (27 cases), changing the variant salt (27), dropping case folding from exact matching (2), and dropping the '+' from positive float exponents (4). Two divergences the port found and had to reproduce rather than fix: an integer JSON literal and a float one render differently forever (1e3 is 1000.0, never 1000), and distinct_id must be present but may be empty. Co-authored-by: Hanzo Dev <[email protected]>