The type for font weights. Usually
`W400 denotes a normal weight and
`W700, a bold weight.
The type for fonts. The size is expressed in
Vg's coordinate space, the em unit of the font is scaled to that size.
equal_f eq font font' is like
equal but uses
eq to test floating point values.
compare_f cmp font font' is like
compare but uses
cmp to compare floating point values.
val to_string : t -> string
to_string font is a textual representation of