Reduce allocations

Author: MilesCranmer

src/utils.jl

@@ -114,8 +114,8 @@ end
 
 string_rational(x) = isinteger(x) ? string(round(Int, x)) : string(x)
 pretty_print_exponent(io::IO, x) = print(io, to_superscript(string_rational(x)))
-const SUPERSCRIPT_MAPPING = ['⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹']
-const INTCHARS = ['0' + i for i = 0:9]
+const SUPERSCRIPT_MAPPING = ('⁰', '¹', '²', '³', '⁴', '⁵', '⁶', '⁷', '⁸', '⁹')
+const INTCHARS = ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9')
 to_superscript(s::AbstractString) = join(
     map(replace(replace(s, "-" => "⁻"), r"//" => "ᐟ")) do c
         c ∈ INTCHARS ? SUPERSCRIPT_MAPPING[parse(Int, c)+1] : c