v0.5.1

Added Features

• Adding setw and setfill to ostream
• Adding estd::expected and estd::unexpected

Quality Updates & Bug Fixes

• Fixing signed/unsigned mismatch in out_span_streambuf
• Fixing estd::optional bug when using reset on enum type
• Adding edge case optimization to estd::tuple (see FEATURE_ESTD_SPARSE_TUPLE)

Known Issues & Limitations

• estd::expected:
  • Not well tested outside of c++11 GCC, though designed to be compatible with c++03
  • Various edge cases like returning && value() not yet implemented