Add field magic support

[wcampbell0x2a]

• Add docs

[github-actions]

Benchmark for ae5d37f

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Test	Base	PR	%
count_from_u8_specialize	96.1±0.89ns	96.3±1.54ns	+0.21%
count_no_specialize	2.4±0.02µs	2.4±0.03µs	0.00%
count_specialize	97.6±2.59ns	97.3±2.30ns	-0.31%
deku_read_bits	1200.3±8.91ns	1176.5±21.89ns	-1.98%
deku_read_byte	4.9±0.11ns	4.5±0.08ns	-8.16%
deku_read_enum	4.1±0.03ns	3.8±0.07ns	-7.32%
deku_read_vec	30.2±0.76ns	30.7±0.84ns	+1.66%
deku_write_bits	190.6±7.57ns	192.6±8.08ns	+1.05%
deku_write_byte	26.1±0.30ns	26.1±0.51ns	0.00%
deku_write_enum	23.9±0.22ns	23.9±0.53ns	0.00%
deku_write_vec	424.8±9.12ns	428.3±8.14ns	+0.82%
read_all	4.4±0.13µs	5.0±0.04µs	+13.64%
read_all_bytes	4.9±0.03µs	4.2±0.14µs	-14.29%

[github-actions]

Benchmark for 921c5b7

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Test	Base	PR	%
count_from_u8_specialize	116.5±1.80ns	91.7±0.91ns	-21.29%
count_no_specialize	2.4±0.03µs	2.6±0.03µs	+8.33%
count_specialize	95.8±1.13ns	96.3±1.24ns	+0.52%
deku_read_bits	1166.8±15.60ns	1186.8±18.32ns	+1.71%
deku_read_byte	4.2±0.04ns	4.7±0.09ns	+11.90%
deku_read_enum	3.6±0.04ns	4.7±0.07ns	+30.56%
deku_read_vec	30.1±0.20ns	30.3±0.60ns	+0.66%
deku_write_bits	191.7±20.13ns	183.9±6.50ns	-4.07%
deku_write_byte	26.1±0.50ns	26.3±1.71ns	+0.77%
deku_write_enum	23.9±0.31ns	23.9±0.46ns	0.00%
deku_write_vec	446.5±21.24ns	448.0±7.43ns	+0.34%
read_all	4.9±0.04µs	5.0±0.04µs	+2.04%
read_all_bytes	5.0±0.07µs	5.2±0.24µs	+4.00%

[github-actions]

Benchmark for f2e25c4

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Test	Base	PR	%
count_from_u8_specialize	99.1±0.96ns	94.0±1.01ns	-5.15%
count_no_specialize	2.4±0.02µs	2.4±0.03µs	0.00%
count_specialize	104.6±1.19ns	97.7±1.39ns	-6.60%
deku_read_bits	1190.9±15.94ns	1172.4±13.00ns	-1.55%
deku_read_byte	4.2±0.08ns	4.2±0.15ns	0.00%
deku_read_enum	3.6±0.06ns	3.2±0.03ns	-11.11%
deku_read_vec	30.1±0.46ns	30.3±1.77ns	+0.66%
deku_write_bits	182.7±3.98ns	188.7±11.22ns	+3.28%
deku_write_byte	26.1±0.45ns	26.1±0.50ns	0.00%
deku_write_enum	23.9±0.32ns	23.9±0.37ns	0.00%
deku_write_vec	434.0±6.25ns	445.1±8.16ns	+2.56%
read_all	5.0±0.07µs	4.2±0.04µs	-16.00%
read_all_bytes	5.0±0.03µs	4.2±0.08µs	-16.00%

[sharksforarms]

nice

[wcampbell0x2a]

@sharksforarms rebased

[github-actions]

Benchmark for ceed057

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Test	Base	PR	%
count_from_u8_specialize	114.1±1.30ns	99.8±0.71ns	-12.53%
count_no_specialize	4.1±0.01µs	2.8±0.10µs	-31.71%
count_specialize	109.9±1.19ns	96.8±1.35ns	-11.92%
deku_read_bits	1208.8±27.03ns	1180.8±66.54ns	-2.32%
deku_read_byte	4.9±0.06ns	4.9±0.05ns	0.00%
deku_read_enum	4.1±0.06ns	4.1±0.05ns	0.00%
deku_read_vec	31.1±1.80ns	30.9±0.92ns	-0.64%
deku_write_bits	243.7±4.32ns	234.0±7.31ns	-3.98%
deku_write_byte	24.0±0.37ns	23.9±0.58ns	-0.42%
deku_write_enum	22.9±0.31ns	22.6±0.31ns	-1.31%
deku_write_vec	503.9±13.11ns	494.4±31.37ns	-1.89%
read_all	7.6±0.14µs	4.9±0.07µs	-35.53%
read_all_bytes	7.5±0.06µs	5.0±0.13µs	-33.33%