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docs: add description of incompatible behavior in Validation #7934

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Sep 14, 2023
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docs: add description of incompatible behavior in Validation #7934

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2 changes: 2 additions & 0 deletions user_guide_src/source/installation/upgrade_validations.rst
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Expand Up @@ -18,6 +18,8 @@ What has been changed
Use :ref:`Rule Classes <validation-using-rule-classes>` or
:ref:`Closure Rule <validation-using-closure-rule>`
instead.
- In CI3, Callbacks/Callable rules were prioritized, but in CI4, Closure Rules are
not prioritized, and are checked in the order in which they are listed.
- CI4 validation format rules do not permit empty string.
- CI4 validation never changes your data.
- Since v4.3.0, :php:func:`validation_errors()` has been introduced, but the API is different from CI3's.
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