Add missing test case for writing unknown attributes
HashWithIndifferentAccess#dup doc [ci skip]

The phrase "exact copy" in the existing docmentation is somewhat
misleading.
Merge pull request #15440 from ilikepi/pr_docs_activesupport_hwia_dup

HashWithIndifferentAccess#dup doc [ci skip]
Merge pull request #15437 from sgrif/sg-missing-test-case

Add missing test case for writing unknown attributes
Clear all caches calculated based on `@columns` when `@columns` changes
Update documentation for setting asset_host to a Proc, mention that the request parameter might not be supplied [ci skip]
[ci skip] Correct documentation of HashWithIndifferentAccess#dup
Merge pull request #15445 from krautcomputing/fix_asset_host_docs

Update documentation for setting asset_host to a Proc [ci skip]
Merge pull request #15446 from akshay-vishnoi/doc_changes

[ci skip] Correct documentation of HashWithIndifferentAccess#dup
Tiny formatting fix in AS change log [ci skip]
Merge pull request #15434 from sgrif/sg-clear-caches

Clear all caches calculated based on `@columns` when `@columns` changes
[ci skip] Correct output of Hash#symbolize_keys
Merge pull request #15448 from akshay-vishnoi/doc_changes

[ci skip] Correct output of Hash#symbolize_keys