Re: BUG #18544: Setting local config_parameter to DEFAULT behaves unexpectedly when using period in config name

Hi,

I think the most confusing part is the documentation saying:
"""
DEFAULT can be written to specify resetting the parameter to its
default value (that is, whatever value it would have had if no SET had
been executed in the current session).
"""

It would be expected that subsequent calls to `current_setting()` should throw an error (without the "t" parameter.) As would have been the case if `SET` hadn't ever been executed in the session. This is increasingly confusing when a call to `SET LOCAL "foo.bar" TO 'baz';` runs inside a transaction, as this will affect behaviour outside of the transaction. As can be seen here: