Setting scale and precision for MySQL float column

I believe I've found an undocumented way to correctly set the float(scale,precision) column type for MySQL using Phinx, but before I make a PR to add it to the documentation, I figured I'd better ask here if this is intended correct behavior, or lucky happenstance.

Example

I have a column with definition float(3,2) and I need to expand it to be float(4,2).

The following appears to work, but is undocumented in both the Phinx and CakePHP documentation.

public function up(): void
{
    $this->table('my_table')
        ->changeColumn('my_column', 'float', ['scale' => 2, 'precision' => 4])
        ->save();
}

Review the documented column-change behavior in the Phinx and CakePHP documentation, using the issue's float(3,2) to float(4,2) example as the starting point. Confirm whether the scale and precision options are intended for MySQL float columns; done means the supported behavior and example are clearly documented, or the issue is resolved with an explicit explanation.