8.2.20211014150008

What's Changed

• pycodegen: collapse unions of identical types & format with black by @mr-c in #443
• document the need for lockfile by @mr-c in #444
• Test with Python 3.10 by @mr-c in #445
• build binary wheels for Python 3.10 by @mr-c in #446
• release-test: fixes for Python 3.10 compat by @mr-c in #447
• use types from Black directly by @mr-c in #448

Full Changelog: 8.2.20210918131710...8.2.20211014150008