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<?php foreach (['NULL', null, 0, false, ''] as $foo) { var_dump( $foo, is_null($foo) ); echo "\n\n"; }
Output for git.master, git.master_jit, rfc.property-hooks
string(4) "NULL" bool(false) NULL bool(true) int(0) bool(false) bool(false) bool(false) string(0) "" bool(false)

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