Fix length counting of zero sized values

[chenyan-dfinity]

No description provided.

[github-actions]

Benchmark for 5f9c179

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Test	Base	PR	%
Blob/&str	210.8±119.26µs	211.0±119.56µs	+0.09%
Blob/ByteBuf	142.0±48.01µs	134.2±49.00µs	-5.49%
Blob/Bytes	106.7±46.08µs	106.7±44.71µs	0.00%
Blob/String	246.4±130.51µs	245.6±130.36µs	-0.32%
Collections/vec (text, nat)	63.1±0.70ms	63.2±0.72ms	+0.16%
Collections/vec int	30.2±0.09ms	31.1±0.08ms	+2.98%
Collections/vec int64	17.4±0.21ms	17.8±0.14ms	+2.30%
Collections/vec nat8	13.2±0.07ms	13.1±0.08ms	-0.76%
option list/1024	1328.9±1.36µs	1349.4±5.53µs	+1.54%
profiles/1024	2.6±0.01ms	2.5±0.02ms	-3.85%
variant list/1024	1120.0±1.65µs	1134.2±4.54µs	+1.27%

[github-actions]

Benchmark for 1072bd7

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Test	Base	PR	%
Blob/&str	223.3±57.08µs	248.9±70.84µs	+11.46%
Blob/ByteBuf	158.6±44.94µs	161.4±45.24µs	+1.77%
Blob/Bytes	107.9±30.36µs	110.4±32.22µs	+2.32%
Blob/String	235.1±68.90µs	251.0±67.22µs	+6.76%
Collections/vec (text, nat)	70.2±1.04ms	70.9±1.40ms	+1.00%
Collections/vec int	32.6±0.06ms	33.3±0.11ms	+2.15%
Collections/vec int64	19.4±0.25ms	19.7±0.14ms	+1.55%
Collections/vec nat8	14.2±0.03ms	13.9±0.03ms	-2.11%
option list/1024	1363.0±15.23µs	1379.9±2.54µs	+1.24%
profiles/1024	2.6±0.00ms	2.6±0.00ms	0.00%
variant list/1024	1133.0±1.86µs	1137.1±2.19µs	+0.36%

[github-actions]

Benchmark for c7eee30

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Test	Base	PR	%
Blob/&str	246.9±67.58µs	222.8±56.57µs	-9.76%
Blob/ByteBuf	157.7±44.35µs	157.0±44.03µs	-0.44%
Blob/Bytes	109.7±30.88µs	107.2±30.42µs	-2.28%
Blob/String	245.2±68.49µs	241.9±66.23µs	-1.35%
Collections/vec (text, nat)	70.4±1.23ms	70.7±1.22ms	+0.43%
Collections/vec int	32.6±0.07ms	32.9±0.06ms	+0.92%
Collections/vec int64	19.4±0.37ms	19.5±0.28ms	+0.52%
Collections/vec nat8	13.9±0.02ms	13.9±0.02ms	0.00%
option list/1024	1386.3±4.44µs	1376.8±2.50µs	-0.69%
profiles/1024	2.7±0.01ms	2.7±0.01ms	0.00%
variant list/1024	1140.5±12.26µs	1129.9±2.00µs	-0.93%

[github-actions]

Benchmark for 2e008f2

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Test	Base	PR	%
Blob/&str	242.8±68.36µs	213.4±59.54µs	-12.11%
Blob/ByteBuf	153.7±45.57µs	156.1±45.00µs	+1.56%
Blob/Bytes	100.9±32.09µs	106.5±30.78µs	+5.55%
Blob/String	239.8±68.58µs	233.5±67.37µs	-2.63%
Collections/vec (text, nat)	69.6±0.79ms	71.2±1.12ms	+2.30%
Collections/vec int	32.4±0.07ms	32.8±0.08ms	+1.23%
Collections/vec int64	19.2±0.22ms	18.8±0.40ms	-2.08%
Collections/vec nat8	13.8±0.02ms	13.7±0.03ms	-0.72%
option list/1024	1383.1±3.08µs	1390.9±2.59µs	+0.56%
profiles/1024	2.7±0.01ms	2.7±0.00ms	0.00%
variant list/1024	1136.7±2.35µs	1151.1±1.73µs	+1.27%

[github-actions]

Benchmark for fa3ccdb

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Test	Base	PR	%
Blob/&str	242.0±69.83µs	214.1±58.84µs	-11.53%
Blob/ByteBuf	154.5±47.10µs	163.0±43.38µs	+5.50%
Blob/Bytes	103.5±31.34µs	110.6±32.04µs	+6.86%
Blob/String	238.9±68.37µs	230.4±68.15µs	-3.56%
Collections/vec (text, nat)	69.9±1.18ms	70.2±0.85ms	+0.43%
Collections/vec int	31.9±0.09ms	33.5±0.54ms	+5.02%
Collections/vec int64	18.7±0.22ms	19.6±0.27ms	+4.81%
Collections/vec nat8	13.8±0.02ms	14.1±0.13ms	+2.17%
option list/1024	1377.3±6.73µs	1383.1±1.41µs	+0.42%
profiles/1024	2.7±0.02ms	2.6±0.01ms	-3.70%
variant list/1024	1133.9±1.94µs	1131.1±1.80µs	-0.25%

[github-actions]

Benchmark for 589a487

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Test	Base	PR	%
Blob/&str	231.4±107.78µs	208.0±59.50µs	-10.11%
Blob/ByteBuf	145.2±47.45µs	145.6±47.26µs	+0.28%
Blob/Bytes	102.4±43.25µs	103.6±43.56µs	+1.17%
Blob/String	268.6±121.72µs	260.4±122.95µs	-3.05%
Collections/vec (text, nat)	65.5±0.83ms	65.0±0.48ms	-0.76%
Collections/vec int	31.4±0.04ms	32.0±0.04ms	+1.91%
Collections/vec int64	17.7±0.18ms	17.3±0.19ms	-2.26%
Collections/vec nat8	13.8±0.01ms	14.2±0.05ms	+2.90%
option list/1024	1374.0±1.12µs	1378.0±3.00µs	+0.29%
profiles/1024	2.7±0.00ms	2.7±0.00ms	0.00%
variant list/1024	1133.3±1.46µs	1133.1±1.89µs	-0.02%