v2.2

collection support: use addTo and putIn for aggregator method names

v2.1

Add aggregation support for ImmutableList, ImmutableSet and ImmutableMap. See #3

v2.0

add collection support, see #3

v1.9

• generate Optional convenience even for Optional<X>, where X is a typevar
• show a proper error message if auto-value class is not found

v1.8

convert null to Optional.empty if possible

v1.7

restrict access: static methods are never public

v1.6

• propagage package-level access
• remove visibility of helper classes
• generate helpful stubs when caching isn't possible

v1.5

Add builder caching via perThreadFactory(). Note that this must be wrapped in a ThreadLocal, see updated README.

v1.4

Validate that the AutoValue_* constructor isn't private. Show a reasonable warning if @AutoValue.Builder is found.

v1.3

handle corner cases: double optional, like <Optional<Optional<String>> or <Optional<X>> where X is a type parameter