Store mtime in zipfile and also retrieve it.
Add very simple support for writing zip files
Zip files written are not compressed, have wrong crc and mtime set to zero.
Store some small changes.
Make function for converting string yield to the main loop so it does not freeze UI.
Pass unit tests in arrays, not in hashes/objects. Each test is function with a name and can be identified by that name.
Add unit test to and fix bug in core.Base64.
Add two tests and make them pass in the three runtimes.
Add three Zip unit tests and make them pass on the command-line.
Refactoring snapshot. Not done yet.
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