fix IDLValue blob conversion

[chenyan-dfinity]

No description provided.

[github-actions]

Benchmark for 6414154

Click to view benchmark

Test	Base	PR	%
Blob/&str	635.0±90.46µs	640.5±97.33µs	+0.87%
Blob/ByteBuf	357.3±91.48µs	355.7±89.82µs	-0.45%
Blob/Bytes	403.7±76.65µs	409.5±78.68µs	+1.44%
Blob/String	646.9±244.87µs	658.0±258.41µs	+1.72%
Collections/vec (text, nat)	49.4±1.34ms	49.0±2.78ms	-0.81%
Collections/vec int	23.3±0.11ms	23.2±0.22ms	-0.43%
Collections/vec int64	15.7±0.07ms	15.3±0.15ms	-2.55%
Collections/vec nat8	11.6±0.09ms	11.6±0.04ms	0.00%
option list/1024	958.3±36.47µs	957.6±23.06µs	-0.07%
profiles/1024	1776.1±23.75µs	1777.0±39.39µs	+0.05%
variant list/1024	800.1±58.46µs	787.2±6.15µs	-1.61%

[github-actions]

Benchmark for 712991e

Click to view benchmark

Test	Base	PR	%
Blob/&str	619.2±105.35µs	594.9±88.34µs	-3.92%
Blob/ByteBuf	359.7±87.22µs	365.9±86.30µs	+1.72%
Blob/Bytes	386.1±63.74µs	357.4±60.02µs	-7.43%
Blob/String	334.7±138.64µs	373.3±126.49µs	+11.53%
Collections/vec (text, nat)	50.7±1.88ms	50.3±1.26ms	-0.79%
Collections/vec int	23.0±0.16ms	23.9±0.31ms	+3.91%
Collections/vec int64	15.9±0.48ms	15.8±0.10ms	-0.63%
Collections/vec nat8	11.1±0.03ms	11.2±0.11ms	+0.90%
option list/1024	983.9±35.71µs	970.8±39.09µs	-1.33%
profiles/1024	1817.1±63.74µs	1761.3±48.89µs	-3.07%
variant list/1024	790.6±10.65µs	799.9±8.90µs	+1.18%

[github-actions]

Benchmark for 33e1a55

Click to view benchmark

Test	Base	PR	%
Blob/&str	619.2±89.12µs	620.0±97.30µs	+0.13%
Blob/ByteBuf	350.6±89.49µs	352.0±84.48µs	+0.40%
Blob/Bytes	393.2±75.35µs	397.0±75.71µs	+0.97%
Blob/String	641.3±259.23µs	638.8±252.47µs	-0.39%
Collections/vec (text, nat)	50.0±1.68ms	49.5±1.33ms	-1.00%
Collections/vec int	23.1±0.18ms	23.1±0.12ms	0.00%
Collections/vec int64	15.0±0.07ms	14.8±0.15ms	-1.33%
Collections/vec nat8	11.7±0.36ms	11.6±0.03ms	-0.85%
option list/1024	959.4±28.49µs	972.3±9.47µs	+1.34%
profiles/1024	1785.5±16.90µs	1801.9±44.09µs	+0.92%
variant list/1024	803.3±12.91µs	800.9±7.61µs	-0.30%