Case-Insensitive ZSH Suffix Aliases

In my .zshrc I've set up suffix completion aliases like this so that I can open files more easily: ``` alias -s -- txt='mate -w' ``` Which allows me to open text files in my text editor without prepending the editor command. There is a problem, however, when I am attempting to open a file with a capitalized suffix. ZSH will recognize '.txt' and open it in my text editor but not '.TXT.' Is there any way to make ZSH suffix recognition case-insensitive so that I can open files like these?