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11a020eb6e
This is useful to allow to set GUCs to values that include spaces; something that wasn't previously possible. The primary case motivating this is the desire to set default_transaction_isolation to 'repeatable read' on a per connection basis, but other usecases like seach_path do also exist. This introduces a slight backward incompatibility: Previously a \ in an option value would have been passed on literally, now it'll be taken as an escape. The relevant mailing list discussion starts with 20140204125823.GJ12016@awork2.anarazel.de.