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  2. ess

Source

ess / texi / stabilty.texi

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Versions 5.1.x are meant to be gamma-level releases.  While some bugs
are fixed, others may have been introduced, especially with
regards to new features.  See the file doc/TODO for details.  Bug
reports are solicited; see the Bugs Section below.  Patches or
suggested coding fixes with bug reports are much appreciated!