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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 9.0b2 arises from the check-in with tag core-9-0-b2.
Release Tcl 9.0b3 arises from the check-in with tag core-9-0-b3.
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.
## 64-bit capacity: Data values larger than 2Gb
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