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<?php for ($i = 0; $i < 17; $i++) { ini_set("precision", $i); var_dump(1.0 === 1.901 - 0.709 - 0.192); }
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false) bool(false)

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