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Clarify that performance improvements are not backported #1826

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Clarify that performance improvements are not backported #1826

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b387c9b
📝 docs: clarify optimizations are not backported
gaborbernat Jun 5, 2026
d1612a0
📝 docs: fold performance note into existing rule
gaborbernat Jun 5, 2026
23c0153
🔧 chore: re-trigger Read the Docs build
gaborbernat Jun 5, 2026
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4 changes: 3 additions & 1 deletion developer-workflow/development-cycle.rst
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Expand Up @@ -75,7 +75,9 @@ releases; the terms are used interchangeably. These releases have a
**micro version** number greater than zero.

The only changes allowed to occur in a maintenance branch without debate are
bug fixes, test improvements, and edits to the documentation.
bug fixes, test improvements, and edits to the documentation. Performance
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@StanFromIreland StanFromIreland Jun 5, 2026

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I don't really get why "performance improvements" are special here, they are features, and we already explicitly state (albeit elsewhere):

The only branch that receives new features is main, the in-development branch.

In this event, I think everything generally went according to the docs: can't backport features "without debate," however exceptions can be made, provided you open a discussion first.

improvements are not among them: an optimization can introduce a regression,
and a regression in a maintenance release is painful to track down and undo.
Also, a general rule for maintenance branches is that compatibility
must not be broken at any point between sibling micro releases (3.12.1, 3.12.2,
etc.). For both rules, only rare exceptions are accepted and **must** be
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