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If object does not have key, add it.
Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://update.greasyfork.org/scripts/427473/937466/object_setDefault.js
Added method setDefault to object prototype.
function setDefault (key, value)If object does not have key, add it with value value
key (string, required)key to checkvalue (any, optional, default = undefined)value for key if it's not present