[TASK] Deprecate variables that start with a "_" #1253
Merged
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In preparation for the possible introduction of more internal
constants in Fluid, custom variable names that start with an
underscore will no longer be allowed.
For Fluid v4, a deprecation is emitted. In a follow-up for Fluid v5,
the deprecation will be replaced with an exception.
Related: #1166
Related: #1041