Changelog

0.2.0 - 2026-07-25

PolymarketClob.Order.Payload.post_body/2 — converts a signed order (builder output) into the exact POST /order request body the official Python v2 client sends (order wrapper, orderType, owner, deferExec, postOnly; side 0/1 → "BUY"/"SELL", salt string → integer). Pinned byte-identical against the post_body entries in test/fixtures/parity/orders.json. This closes the last gap in the local order pipeline: build → sign → payload → post.

Order salt bounded to 48 bits (Order.Builder). Full 64-bit random salts (values > 2^63) intermittently broke the CLOB signature check: the exchange parses the POSTed salt as a limited-precision JSON integer, so any value above the JS/JSON safe-integer range (2^53) is silently rounded — the exchange then hashes a different salt than the one that was signed, and the signature no longer matches. Result: ~70% of otherwise-valid orders rejected with "Invalid order payload". Salt is now drawn from 48 bits (< 2^53), which serializes losslessly and stays collision-astronomically-safe at any real order volume.