Document that unserialised data types are stored as strings in the database and returned as such by the meta data functions. For example, setting meta data to the integer value `1` will be returned as `"1"` when subsequently queried via `get_metadata()` and the related functions. Props sukhendu2002, azaozz, jrf, rodrigosprimo. Fixes ticket:61950. Built from https://develop.svn.wordpress.org/trunk@59657 git-svn-id: http://core.svn.wordpress.org/trunk@59000 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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