This release of optional lite contains the following changes:
Additions:
- Add script 
tc-cl.bat(nonstd-lite-project issues 54). - Add macro 
optional_static_assert()and compile-time checks on T. - Add PlatformIO library manifest file 
library.json(replaces #64, thanks to @Nullfati). - Add 
export()toCMakeLists.txtenabling importing targets. See nonstd-lite-project issues 50. 
Changes:
- Enhance in-place construction (#66, thanks @@fekir).
 - Change to use 
#if defined(_MSC_VER)to avoid-Wundefwarning (#65, thanks @eepp). - Change usage of 
=defaultwith test structures to VS2015 for (#61). - Handle lest test framework as system include to prevent warnings.
 
Fixes:
- Fix 
value_or()from changing stored value (issue #60, thanks @deadem, @mortenfyhn and @phprus).