This function doesn't appear to work at all. You have to create a new BCMath\Number object to use it, at which point it attempts to overwrite the value of said object - and of course that won't work because BCMath\Number::$value is readonly.
(PHP 8 >= 8.4.0)
BcMath\Number::__unserialize — Deserializes a data parameter into a BcMath\Number object
Deserializes a data parameter into a BcMath\Number object.
dataThis method throws a ValueError if invalid serialized data is passed.
This function doesn't appear to work at all. You have to create a new BCMath\Number object to use it, at which point it attempts to overwrite the value of said object - and of course that won't work because BCMath\Number::$value is readonly.