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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 9.0.1 arises from the check-in with tag `core-9-0-1`.
Tcl patch releases have the primary purpose of delivering bug fixes
to the userbase. As the first patch release in the Tcl 9.0.\* series,
Tcl 9.0.1 also includes a small number of interface changes that complete
some incomplete features first delivered in Tcl 9.0.0.
## Changes since Tcl 9.0.0
- [zlib-8.8, zlib-8.16 fail on Fedora 40, gcc 14.1.1](https://core.tcl-lang.org/tcl/tktview/73d5cb)
- [install registry and dde in $INSTALL_DIR\lib always](https://core.tcl-lang.org/tcl/tktview/364bd9)
- [cannot build .chm help file (Windows)](https://core.tcl-lang.org/tcl/tktview/bb110c)
- [TIP 701 - Tcl_FSTildeExpand C API](https://core.tcl-lang.org/tips/doc/trunk/tip/701.md)
- [buffer overwrite for non-BMP characters in utf-16](https://core.tcl-lang.org/tcl/tktview/66da4d)
- [TIP 609 - required Tcl_ThreadAlert() skipped with nested event loop](https://core.tcl-lang.org/tcl/info/c7e4c4)
- [Size modifiers j, q, z, t not implemented]( https://core.tcl-lang.org/tcl/info/c4f365)
- [TIP 707 - ptrAndSize internal rep in Tcl_Obj](https://core.tcl-lang.org/tips/doc/trunk/tip/707.md)
- [cannot build .chm help file (Windows)](https://core.tcl-lang.org/tcl/tktview/bb110c)
# Incompatibilities
- No known incompatibilities with the Tcl 9.0.0 public interface.
# Updated bundled packages, libraries, standards, data
- Itcl 4.3.2
- sqlite3 3.47.2
- Thread 3.0.1
- TDBC\* 1.1.10
- tcltest 2.5.9
- tzdata 2024b, corrected
Release Tcl 9.0.0 arises from the check-in with tag `core-9-0-0`.
Highlighted differences between Tcl 9.0 and Tcl 8.6 are summarized below,
with focus on changes important to programmers using the Tcl library and
writing Tcl scripts.
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- configurable properties
- `method -export`, `method -unexport`
# Known bugs
- [changed behaviour wrt command names, namespaces and resolution](https://core.tcl-lang.org/tcl/tktview/f14b33)
- [windows dos device paths inconsistencies and missing functionality](https://core.tcl-lang.org/tcl/tktview/d8f121)
- [load library (dll) from zipfs-library causes a leak in temporary folder](https://core.tcl-lang.org/tcl/tktview/a8e4f7)
- [lsearch -stride with -subindices and -inline -all gives unexpected result](https://core.tcl-lang.org/tcl/tktview/5a1aaa)
- [[namespace children] doesn't match non-glob patterns below global namespace](https://core.tcl-lang.org/tcl/tktview/63449c0514)
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