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The source code for Tcl is managed by fossil. Tcl developers coordinate all
changes to the Tcl source code at
> [Tcl Source Code](https://core.tcl-lang.org/tcl/timeline)
Release Tcl 9.1a0 arises from the check-in with tag `core-9-1-a0`.
Highlighted differences between Tcl 9.1 and Tcl 9.0 are summarized below,
with focus on changes important to programmers using the Tcl library and
writing Tcl scripts.
# New public C API
- [Tcl\_IsEmpty checks if the string representation of a value would be the empty string](https://core.tcl-lang.org/tips/doc/trunk/tip/711.md)
- [Tcl\_GetEncodingNameForUser returns name of encoding from user settings](https://core.tcl-lang.org/tips/doc/trunk/tip/716.md)
- [Tcl\_AttemptCreateHashEntry - version of Tcl\_CreateHashEntry that returns NULL instead of panic'ing on memory allocation errors](https://core.tcl-lang.org/tips/doc/trunk/tip/717.md)
# Performance
- [Memory efficient internal representations](https://core.tcl-lang.org/tcl/wiki?name=New+abstract+list+representations)
for list operations on large lists.
# Bug fixes
- [tclEpollNotfy PlatformEventsControl panics if websocket disconnected](https://core.tcl-lang.org/tcl/tktview/010d8f38)
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