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<?php var_dump(filter_var('holger@hütig.de', FILTER_VALIDATE_EMAIL)); var_dump(filter_var('holger@xn--htig-0ra.de', FILTER_VALIDATE_EMAIL));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) string(22) "holger@xn--htig-0ra.de"

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