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<?php $mynumber = (float) "3.8e-7"; var_dump($mynumber); printf('%.90F', $mynumber);
Output for git.master, git.master_jit, rfc.property-hooks
float(3.8E-7) Notice: printf(): Requested precision of 90 digits was truncated to PHP maximum of 53 digits in /in/qqJ3W on line 5 0.00000038000000000000001456801801587304101559539049049

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