Cloudpickle register by value

[ian-r-rose]

Proposed fix for #6464

• Tests added / passed
• Passes pre-commit run --all-files

[github-actions]

Unit Test Results

       15 files  ±0         15 suites  ±0   6h 26m 10s ⏱️ + 15m 29s
  2 820 tests +1    2 738 ✔️ ±0    81 💤 +1  1 ❌ ±0 
20 903 runs  +7  19 963 ✔️ +8  939 💤 ±0  1 ❌  - 1 

For more details on these failures, see this check.

Results for commit 8b82ca7. ± Comparison against base commit 1346671.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

       15 files  +       3         15 suites  +3   10h 20m 22s ⏱️ + 3h 3m 3s
  2 898 tests +       1    2 811 ✔️ +     10    82 💤  -   12  5 ❌ +3 
21 465 runs  +4 917  20 502 ✔️ +4 763  958 💤 +151  5 ❌ +3 

For more details on these failures, see this check.

Results for commit 4e4ac45. ± Comparison against base commit a8eb3b2.

[ian-r-rose]

Thanks @fjetter !