Key verification crashes under latest PHP versions

[Firehed]

php/php-src#16870

Fatal error: Uncaught ValueError: base and exponent overflow in /in/lnhXp:4
Stack trace:
#0 /in/lnhXp(4): gmp_pow(Object(GMP), 3)
#1 {main}
  thrown in /in/lnhXp on line 4

Process exited with code 255.

https://3v4l.org/lnhXp

For now, avoid updating to 8.4.1/8.3.14/8.2.26.

[Girgias]

As I just mentioned in the thread, it seems you could use the fact that the overloading of ** was missed by the broken "fix".

So you could rewrite it as: $gmpObject ** 3, and it "should" work.