[PHP-NOTES] note 130182 added to class.bcmath-number

BcMath\Number is one of those classes that overloads boolean casting.
If $z = new BcMath\Number(0) then $z is considered falsy (and hence, for example, empty($z)==true) even though it is a genuine Number object.
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Manual Page -- https://php.net/manual/en/class.bcmath-number.php
Edit        -- https://main.php.net/note/edit/130182
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Del: spam        -- https://main.php.net/note/delete/130182/spam
Del: non-english -- https://main.php.net/note/delete/130182/non-english
Del: in docs     -- https://main.php.net/note/delete/130182/in+docs
Del: other reasons-- https://main.php.net/note/delete/130182
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