Julia-ism for two-dimensional map?

lordie…what is this? can someone give me a pointer, please?

PS: May I point out that ns are not comparable across computers?

Yeah, just tried on another computer, and the SVector version is just slightly faster:

julia> @benchmark orig($xset, $yset)
BenchmarkTools.Trial: 
  memory estimate:  1.31 KiB
  allocs estimate:  8
  --------------
  minimum time:     407.743 ns (0.00% GC)
  median time:      430.580 ns (0.00% GC)
  mean time:        500.106 ns (10.39% GC)
  maximum time:     6.392 μs (88.50% GC)
  --------------
  samples:          10000
  evals/sample:     206

julia> @benchmark svec($xset, $yset)
BenchmarkTools.Trial: 
  memory estimate:  1.91 KiB
  allocs estimate:  10
  --------------
  minimum time:     404.726 ns (0.00% GC)
  median time:      425.562 ns (0.00% GC)
  mean time:        544.980 ns (19.62% GC)
  maximum time:     7.589 μs (90.31% GC)
  --------------
  samples:          10000
  evals/sample:     201