Miscellaneous
Serial Line I/O
The serial line drivers were converted to use threads so you can wait for I/O with fileevent when using serial devices. There is no API change here, but this was a limitation that was annoying in previous Tcl releases.
tcl_platform(user)
The tcl_platform(user) array element records the currently logged in user. This masks difference in environment variables and system calls used to get this information on different platforms.
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