[plt-scheme] Using 'lang' with relative paths in mzscheme 3.99?

I'm doing a project where I'm defining my own module language, and would 
like to be able to say something like:


######################
#lang "mylanguage.ss"
######################

but mzscheme 3.99 currently errors out with:

#######################################################################
read: expected only alphanumberic, `-', `+', `_', or `/' characters for 
`#lang', found "
#######################################################################

I can get around this by using the longhand "(module ...)" form or by 
writing my own #reader, but this is slightly awkward.  Is there a plan to 
remove the syntactic restriction on what comes after #lang?  Thanks!