user emails comparison should be case insensitive

[asaifm]

In user.php for wordpress 5.7: https://core.trac.wordpress.org/browser/tags/5.7/src/wp-includes/user.php email update comparisons are case sensitive. Is there a specific reason for this? Because emails are case insensitive. Here is the line that does that:

if ( isset( $userdata['user_email'] ) && $user['user_email'] !== $userdata['user_email'] )

Can the function:

strcasecmp

be used instead? The problem is that there is a plugin that uses the function:

wp_update_user

And it would send a notification for email change even if it was the casing of the characters only.

Thanks for your time and consideration