-font does not accept characters

[peachey2k2]

msdfgen --help specifies that -font takes a .ttf file along with one of the following:

• a glyph index prefixed with letter g or G
• a character code (undocumented: optionally prefixed with u or U)
• a character in apostrophes, (ex: 'A')

-font <filename.ttf> <character code>
	Loads a single glyph from the specified font file.
	Format of character code is '?', 63, 0x3F (Unicode value), or g34 (glyph index).

However, the last option does not work, and results in an assert being triggered. As an example:

msdfgen sdf -font ./Miracode.ttf 'A' -o test.png -dimensions 64 64 -pxrange 4 -testrender render.png 1024 1024

results in:

No character specified! Use -font <file.ttf/otf> <character code>. Character code can be a Unicode index (65, 0x41), a character in apostrophes ('A'), or a glyph index prefixed by g (g36, g0x24).