Polishing along with backports to 3.1.4
Deprecated CachingMapDecorator (following the deprecation of LabeledEnum support)
Inlined AntPathStringMatcher into AntPathMatcher

Also initializing the capacity of the AntPathStringMatcher cache to 256 now.
Consistent fine-tuning of synchronized and concurrent data structures

In particular, avoiding synchronized Sets and Maps wherever possible (preferring a ConcurrentHashMap even instead of a synchronized Set) and specifying appropriate ConcurrentHashMap initial capacities (even if we end up choosing 16).
Removed "target" entry from gitignore, allowing to commit changes to the "org.springframework.aop.target" package
Revert "Cache MethodParameter annotation lookup results"

This reverts commit c10d63dc011c95b3e24d4ed8d7140c73053736c6.
Polishing
SpEL indexer uses direct access to specific List elements instead of iterating over the Collection

Issue: SPR-10035
Final preparations for 3.2 GA
Update API links in reference documentation

Replace all API links with the correct springsource.org URL
Update migration guide regarding spring-test

This commit adds information to the 3.2 migration guide regarding
deprecations and Maven dependencies in the spring-test module.
Polish the migration guide

 - Added missing <para> tags to the JDiff reports section.

 - Converted tabs to spaces.
What's new and migration doc updates
SpEL correctly handles "is" accessors with Boolean return type

Issue: SPR-10091
DefaultMessageListenerContainer clears resources of paused tasks when shutting down after stop

Issue: SPR-10092
Final preparations for 3.2 GA
Minor rewording
Remove previousVersion from 'jdiff' Gradle task
Upgrade reference plugin to version 0.2.4

Pick up fix for regression in version 0.2.3 that caused project-specific
images, e.g. diagrams not to be copied into the images/ folder, thereby
causing broken image links online and in the PDF.
Update "what's new" in 3.1 and 3.2 sections

 - Remove unnecessary "overview of new features" section in 3.1
 - Mention new Gradle build and GitHub-based source control in 3.2