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Internal action support.
An internal action is only used by Freeciv itself, not by the rulesets. This is because it isn't ready for the ruleset yet.
If a ruleset tries to write an enabler for an internal only action: "Sorry. City Build Unit is not ready for ruleset exposure yet."
Can't appear in requirement vectors in the ruleset. Refuses to load requirement vectors requiring an internal action. Skips writing effects etc that refers to internal actions.