wrap test that changes inflections in with_dup
implement rename_index natively for MySQL > 5.7
Merge pull request #13084 from lihanli/series-singularize-fix

Fix an activesupport inflector test changing the inflector but not reverting all its changes afterwards
Merge pull request #13038 from ccutrer/mysql_rename_index

implement rename_index natively for MySQL > 5.7
The section that mentions after_commit and after_rollback will swallow exceptions should me made clear. Made that section to be a  instead of a regular paragraph.
Merge pull request #13087 from bikramwp/master

Make it prominent that after_commit and after_rollback swallow exceptions.
fix mysql version check in rename_index

also clarify native rename_index support is >= 5.7, not > 5.7
Merge pull request #13093 from ccutrer/fix-mysql-version-check

fix mysql version check in rename_index
Remove `DatabaseStatements#case_sensitive_equality_operator`. It has been deprecated already.
#type_cast - improve performance & readability
Checking no debugger on JRuby

fixes tests for JRuby
updating  options documentation for associations
removed unnecessary test case and improved test case for belongs_to having invalid  options
Merge pull request #13100 from akshay-vishnoi/f-refactor

#type_cast - improve performance & readability
Merge pull request #13099 from kamipo/remove_case_sensitive_equality_operator

Remove `DatabaseStatements#case_sensitive_equality_operator`. It has been deprecated already.
Merge pull request #13095 from kuldeepaggarwal/test-case-updation

removed unnecessary test case
Remove Rdoc formatting from markdown [ci skip]

Use markdown formatting instead
Remove unused variable

This method is not using the block variable directly since it is calling
yield
Typo fix
Merge pull request #13102 from akshay-vishnoi/typo

Typo fix
Fix URL to robots.txt documentation