Calcualte true normals rather than sign

[dgaylo]

Closes #28

[github-actions]

Benchmark Results

--------------------------------------------------------------------------------- benchmark 'test_bench_Chan': 2 tests --------------------------------------------------------------------------------
Name (time in us)               Min                   Max                Mean             StdDev              Median                IQR            Outliers  OPS (Kops/s)            Rounds  Iterations
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_bench_Chan (head)     573.7730 (1.0)        985.9840 (1.0)      602.4269 (1.0)      29.6843 (1.0)      599.9875 (1.0)      17.7330 (1.0)         59;58        1.6600 (1.0)        1746           1
test_bench_Chan (base)     578.0400 (1.01)     1,242.1300 (1.26)     611.3754 (1.01)     37.8030 (1.27)     607.4900 (1.01)     18.9860 (1.07)        61;73        1.6357 (0.99)       1728           1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------- benchmark 'test_bench_WY': 2 tests ------------------------------------------------------------------------
Name (time in ms)           Min               Max              Mean            StdDev            Median               IQR            Outliers       OPS            Rounds  Iterations
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_bench_WY (head)     3.4428 (1.0)      4.2339 (1.0)      3.4950 (1.0)      0.0698 (1.0)      3.4796 (1.0)      0.0315 (1.0)         13;19  286.1243 (1.0)         290           1
test_bench_WY (base)     3.4732 (1.01)     4.2525 (1.00)     3.5409 (1.01)     0.0767 (1.10)     3.5239 (1.01)     0.0441 (1.40)        16;16  282.4126 (0.99)        288           1
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------- benchmark 'test_bench_base': 2 tests ------------------------------------------------------------------------
Name (time in ms)             Min               Max              Mean            StdDev            Median               IQR            Outliers       OPS            Rounds  Iterations
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_bench_base (base)     1.4268 (1.0)      1.8075 (1.0)      1.4641 (1.0)      0.0372 (1.0)      1.4555 (1.0)      0.0235 (1.83)        54;48  683.0117 (1.0)         701           1
test_bench_base (head)     1.9538 (1.37)     3.0486 (1.69)     1.9915 (1.36)     0.0787 (2.12)     1.9741 (1.36)     0.0128 (1.0)         24;56  502.1309 (0.74)        511           1
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

------------------------------------------------------------------------------- benchmark 'test_bench_no_norm': 2 tests --------------------------------------------------------------------------------
Name (time in us)                  Min                 Max                Mean             StdDev              Median                IQR            Outliers  OPS (Kops/s)            Rounds  Iterations
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
test_bench_no_norm (base)     340.5060 (1.0)      646.6580 (1.0)      366.6058 (1.00)     18.1255 (1.0)      363.1830 (1.01)     19.3560 (1.11)       461;79        2.7277 (1.00)       2938           1
test_bench_no_norm (head)     341.4490 (1.00)     685.9040 (1.06)     365.9164 (1.0)      24.1066 (1.33)     361.3260 (1.0)      17.4265 (1.0)        139;92        2.7329 (1.0)        2960           1
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Legend:
  Outliers: 1 Standard Deviation from Mean; 1.5 IQR (InterQuartile Range) from 1st Quartile and 3rd Quartile.
  OPS: Operations Per Second, computed as 1 / Mean

• base: 545df57
• head: 07cbd5f