improve set by 2.5 for simple use cases

[danmayer]

This speeds up set calls by over 2X generally because we will avoid copying and extra allocations for large values.

---

set before:

Warming up --------------------------------------
          client set   304.000 i/100ms
        raw sock set   827.000 i/100ms
Calculating -------------------------------------
          client set      2.998k (± 8.9%) i/s  (333.52 μs/i) -     29.792k in  10.009832s
        raw sock set      8.254k (± 2.8%) i/s  (121.15 μs/i) -     82.700k in  10.027442s

Comparison:
        raw sock set:     8254.3 i/s
          client set:     2998.4 i/s - 2.75x  slower

set now:

Warming up --------------------------------------
          client set   724.000 i/100ms
        raw sock set   828.000 i/100ms
Calculating -------------------------------------
          client set      7.434k (± 2.4%) i/s  (134.51 μs/i) -     74.572k in  10.037368s
        raw sock set      8.209k (± 4.5%) i/s  (121.82 μs/i) -     81.972k in  10.011659s

Comparison:
        raw sock set:     8208.7 i/s
          client set:     7434.2 i/s - 1.10x  slower

[danmayer]