timed

Timed references for imperative state
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Module LICENSE.html
MIT License

Copyright (c) 2018 Rodolphe Lepigre and Christophe Raffalli

Permission is hereby granted,  free of charge,  to any person obtaining a copy
of this software and associated documentation files (the "Software"),  to deal
in the Software without restriction,  including  without limitation the rights
to use,  copy, modify,  merge, publish,  distribute,  sublicense,  and/or sell
copies of the  Software, and  to  permit  persons  to  whom  the  Software  is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED  "AS IS",  WITHOUT WARRANTY OF ANY KIND,  EXPRESS  OR
IMPLIED,  INCLUDING  BUT NOT  LIMITED TO  THE WARRANTIES  OF  MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT  SHALL  THE
AUTHORS  OR  COPYRIGHT  HOLDERS  BE  LIABLE  FOR  ANY CLAIM,  DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN  THE
SOFTWARE.