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Crypto (#19): add the OS cryptographically-secure random surface (random_bytes/random_hex/random_u32, reading /dev/urandom) and a standard base64 encoder, completing the library alongside the existing SHA-256/ HMAC-SHA256/verify_hmac/hex/ct_equal. All pure integer IR, C-free. Uuid (#16): a new namespace for stable, collision-free IDs — v4 (random) and v7 (time-ordered) generation, plus parse/is_valid/to_text/equals/nil. UUIDs are canonical lowercase 36-char strings; v4 and v7's random tail draw from the crypto CSPRNG, so both carry the documented determinism caveat (mint at the edges, never inside lockstep simulation). Reuses the crypto prelude's fn_secure_bytes / fn_hex_encode. - examples/library/{crypto,uuid}.ludic: known-answer vectors (SHA-256, HMAC, base64 per RFC 4231/4648) and structural invariants (uuid version/variant bits, parse/equals), wired into `x test` (now 51 passed). - docs: per-symbol pages for every new method + a new Uuid section; inventory and impl-vs-docs coverage check pass. - seed regenerated; `x bootstrap-cfree` fixpoint holds. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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| id | name | category | kind | tokens | sig | tip | order | ns | member |
|---|---|---|---|---|---|---|---|---|---|
| uuid-nil | Uuid.nil | uuid | namespace-method | Uuid.nil | Uuid.nil() -> string | The all-zero UUID. | 9 | Uuid | nil |
Returns the nil UUID — 00000000-0000-0000-0000-000000000000 — the reserved all-zero value that means "no UUID". Use it as a sentinel for an unset or absent identity, and as the value Uuid.parse returns when it is handed something that is not a valid UUID. It is a well-formed UUID string, so it passes Uuid.is_valid; test for "no id" by comparing against Uuid.nil() explicitly.
program Nil {
entry {
let none = Uuid.nil()
print(none) # 00000000-0000-0000-0000-000000000000
}
}