Isn't base and offset redundant?

[ancapdev]

I guess in most cases these objects are short lived and maybe even some partially constant propagated if all inline, but couldn't you elide the offset field for a small performance gain? I.e., replace

struct Blob{T}
    base::Ptr{Nothing}
    offset::Int64
    limit::Int64
end

With

struct Blob{T}
    base::Ptr{Nothing}
    limit::Ptr{Nothing} # one past end of range
end