pub fn lookup_float(key: &str) -> Option<Float>Expand description
a variant of lookup_value that casts the value into Float
The float counterpart of lookup_number. Float isn’t a TeX register
type (see common::float), but binding authors need a fractional read/write
pair — e.g. NOMINAL_FONT_SIZE at the 11pt class option is 10.95, which
lookup_number/lookup_int would truncate to 10 (issue #542).