uniformFixedValue: avoid re-evaluation on reading or mapping

added 13 commits

• 95606ffe...35ef08ef - 12 commits from branch develop
• 0a65b798 - BUG: uniformFixedValue: do not evaluate upon reading. Fixes #1058 (closed).

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unmarked as a Work In Progress

changed title from WIP: uniformFixedValue: do not evaluate upon reading. Fixes #1058. to uniformFixedValue: avoid re-evaluation on reading or mapping

changed milestone to %v1812

resolved all discussions

mentioned in commit 11ece124

merged