Improve needToDup: use DeepConst to determine whether dup can be igno…

…red because all referenced data is const anyway.

Merge remote-tracking branch 'origin/nogc-write'

Add annotations to array unittests

Update README regarding RefRead

Merge pull request #14 from funkwerk/unittest-attributes

Unittest attributes

Merge pull request #9 from funkwerk/debug_accessors

Fix debug mode

Merge pull request #4 from belka-ew/property

Generate properties

Fix link to the issues