enable sprint() to pass on kwargs

[mgkuhn]

A new optional keyword argument kwargs can now take a named tuple and Base.sprint will then pass on the content of that named tuple as keyword arguments to the function called.

[StefanKarpinski]

Wouldn't it generally be clearer to pass a closure for this kind of usage?

[mgkuhn]

Ah, thanks for the hint, I hadn't thought of that. Slightly slower, but not much:

using BenchmarkTools
wrap(io, strings...; open='(', close=')') = print(io, open, strings..., close)
a = 'a'
@btime sprint(wrap, a...; kwargs = (open='[',))
@btime sprint((s...) -> wrap(s...; open='['), a...)
@btime sprint((s...) -> wrap(s...), a...)
@btime sprint(wrap, a...)

gives

  683.224 ns (10 allocations: 448 bytes)
  1.035 μs (8 allocations: 368 bytes)
  662.226 ns (6 allocations: 320 bytes)
  598.449 ns (6 allocations: 320 bytes)