Fix unit based calculations

[rracariu]

No description provided.

[github-actions]

Coverage after merging fix/unit-calc into master will be

82.61%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/haystack
units.rs	100%	100%	100%	100%
src/haystack/defs
namespace.rs	92.83%	100%	98.94%	91.79%	239, 256, 334, 353, 386, 399, 411, 413, 415, 430, 485, 536, 678, 683, 686, 721, 737–756, 785, 790, 883, 904
src/haystack/units
unit.rs	91.48%	100%	92.31%	91.33%	128, 136, 138, 161–167, 92, 94
src/haystack/val
grid.rs	98.99%	100%	100%	98.80%	233

[github-actions]

Coverage after merging fix/unit-calc into master will be

82.62%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src/haystack
units.rs	100%	100%	100%	100%
src/haystack/defs
namespace.rs	92.83%	100%	98.94%	91.79%	239, 256, 334, 353, 386, 399, 411, 413, 415, 430, 485, 536, 678, 683, 686, 721, 737–756, 785, 790, 883, 904
src/haystack/encoding/zinc
encode.rs	86.92%	100%	83.33%	87.39%	142, 144–145, 147, 149, 182, 237, 240–241, 243, 258, 286, 403, 68–70, 72, 78–80, 84–86, 90–92, 96–98
src/haystack/encoding/zinc/decode
lexer.rs	89.96%	100%	100%	89.16%	122, 131, 195–198, 205–208, 229–233, 236–240, 256, 289, 318
src/haystack/filter
nodes.rs	82.14%	100%	89.19%	80.75%	126, 153–155, 205, 323–325, 335, 337, 340, 342, 344–351, 353, 355, 357–360, 362, 366–367, 377–379, 420–422
src/haystack/units
unit.rs	91.48%	100%	92.31%	91.33%	128, 136, 138, 161–167, 92, 94
src/haystack/val
grid.rs	98.99%	100%	100%	98.80%	233
number.rs	90.08%	100%	94.12%	89.47%	108, 151–155, 157, 159, 172, 198, 222, 243