Only prevent serialization of the Closure object. #352
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Instead of preventing the serialization of all callable values (such as names of functions or those created by create_function), it's better to only prevent the serialization of the Closure object.
The reason I ran into this problem is a value in
$GLOBALS
was"_"
which is a callable function when gettext is installed. Even though the string value had nothing to do with the function which has the same name.