Ignoring character case

I realized that the plugin does not ignoring character case.
In some case, Request URL includes upper characters.
When I url-encoded non-alphabet characters, some service or software export upper characters.

I have a suggestion.
Before to compare the setting url and request url, how about converting upper case to lower case?
—
$this->url=mb_strtolower($this->url);
$url=mb_strtolower($url);
—

Thank you.