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Editorial overhaul of plpgsql documentation. Provide detailed documentation
of variable substitution and plan caching behavior in dedicated sections. (A lot of this material existed already, but was scattered in various places in the chapter.) Reorganize material a little bit, mostly to try to avoid diving into deep details in the first introductory sections. Document some fine points that had escaped treatment before, notably the ability to qualify plpgsql variable names with block labels. Some minor wordsmithing here and there.
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