Rgb() format not detected

[kuntau]

There is this format used by rust tui in ron file

diff_file_added: Rgb(235, 203, 139),    
diff_file_modified: Rgb(180, 142, 173), 

The only different is the capital R. If I change to rgb, it's detected but the rust program won't accept rgb, I think this should be detected.

Another format is little bit different, also use by rust

selection_bg: Rgb(0x2c, 0x32, 0x3c),
push_gauge_bg: Rgb(0x50, 0x79, 0xbe),

This is a bit stretch but would be great if could be supported

Thank you!

[bennypowers]

this rgb format is not detected either:

rgba(100 100 100 / 0.5);