Changes for version 0.13
- Fix a long-standing bug of being unable to define constants from sub-packages at "call" time.
- If you were in the callback for YourExporter::CONSTANT and required a module that also used YourExporter module to get some YourExporter::UNRELATED_CONSTANT we wouldn't create that symbol for that module and we'd most likely die at compile-time.
- The reason for this is that we had a really naïve notion of when we should be interning constants purely based on whether we were in a nested "call" subroutine. Now we keep track of what constants packages want and intern those symbols they request.
- We now use FATAL "recursion" warnings in Constant::Export::Lazy, if we've gone above perl's built-in recursion limit of 100 we'd rather die early than slowly exhaust all the memory on the system and have the OOM killer kill us when this happens.
- Get rid of the Constant::Export::Lazy::Ctx::new() method. Instead we just bless directly into the package, this is just a nano-optimization.
- Add a new test to see if we're actually defining constants, this test piggy-backs on the warnings emitted when our constant subroutines are overridden.
- Clarify & reword some POD & inline comments.
- Constant::Export::Lazy - Utility to write lazy exporters of constant subroutines