char CData can't be directly assigned a number

Description

The following code:

<?php

$v = FFI::new("char[2]");
$v[0] = 65;
var_dump($v);

Resulted in this output:

Fatal error: Uncaught FFI\Exception: Incompatible types when assigning to type 'char' from PHP 'int' in Command line code:1
Stack trace:
#0 {main}
  thrown in Command line code on line 1

But I expected this output instead:

object(FFI\CData:char[2])#1 (2) {
  [0]=>
  string(1) "A"
  [1]=>
  string(1) ""
}

It's somewhat weird to have to type cast around, i.e. I could just do a FFI::cast to uint8_t * and it works. But for some reason, char is special. Seems like an arbitrary restriction to me, and it really should accept both.

PHP Version

master

Operating System

No response

Reproduce the PHP FFI example from the issue and trace the handling of assignments to a char CData value. Locate the relevant FFI implementation and existing FFI tests, then add coverage for assigning an integer to char and verify that the expected character value is produced.