if-else VS case-else VS case

[DMisener]

Using **bency** benchmarking tool -- I get:
    
    
    nim git:(master) ✗ nim r -d:release test_case.nim
    name ............................... min time      avg time    std dv   runs
    if-else ........................... 20.048 ms     20.724 ms    ±0.370   x241
    case-else ......................... 20.078 ms     21.153 ms    ±0.536   x236
    case-all .......................... 20.153 ms     21.113 ms    ±0.376   x236
    
    
    Run

All pretty close.