turns on or off automatic memory management of objc-objects. if on (as it is be default) objc-objects will be released during the usual scheme gc cycle (objc-objects are always retained before being passed into scheme world). if you turn off gc you will need to destroy objc-objects manually by calling objc:destroy, image-destroy etc. Providing no argument returns the current setting
bool -- turs on or off objc garbage collection
Related: objc:call objc:make objc:destroy image-destroy is-objc?
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