Benchmark: running assign, shift, each for at least 1 CPU seconds...
    assign:  2 wallclock secs ( 1.08 usr ) @ 7097.97/s (n=7680)
     shift:  1 wallclock secs ( 1.02 usr ) @ 6973.56/s (n=7120)
         Rate  shift assign
shift  6974/s     --    -2%
assign 7098/s     2%     --
Benchmark: running assign, shift, each for at least 1 CPU seconds...
    assign:  2 wallclock secs ( 1.01 usr ) @ 7587.94/s (n=7679)
     shift:  2 wallclock secs ( 1.08 usr ) @ 7592.04/s (n=8207)
         Rate assign  shift
assign 7588/s     --    -0%
shift  7592/s     0%     --