fixedstring.jl

struct FixedString{N} # Size is a static type parameter
    length::UInt32
    data::NTuple{N, UInt8} # Immutable statically sized tuple
end
function Base.:(==)(a::FixedString, b::FixedString)
    a.length == b.length || return false
    for i in 1:a.length
        a.data[i] == b.data[i] || return false
    end
    return true
end
# some constructors
function Base.convert(::Type{FixedString{N}}, x::String) where N
    FixedString(
        length(x),
        ntuple(Val{N}) do i
            UInt8(i <= length(x) ? x[i] : 0)
        end
    )
end
Base.convert(::Type{String}, x::FixedString) = 
    String([x.data[1:x.length]...])
Base.show(io::IO, x::FixedString) = show(io, String(x))