Qcell version 0.4.0

qcell provides compile-time checked alternatives to RefCell.

Changes for 0.4.0:

  • Splits out TLCell as the thread-local type-based cell, keeping TCell as the process-wide one. This removes an opt-out feature, which in general don't work (features are additive). This is a breaking change from 0.3.

  • Adds Send and Sync where appropriate (thanks to a contributor) and documents the safety reasoning

  • Checks compile_fail doctests using trybuild

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