upgrade to smallvec 2 to fix invariant lifetimes

[samuelcolvin]

Still failing due to LazyIndexMap

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #131 will degrade performances by 29.45%

_{Comparing invariant-lifetimes (e054b28) with main (dd25fd0)}

Summary

⚡ 2 improvements ❌ 4 regressions ✅ 67 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	invariant-lifetimes	Change
❌	lazy_map_lookup_1_10	8.9 µs	11.8 µs	-24.36%
⚡	lazy_map_lookup_2_20	25.5 µs	20.4 µs	+25.07%
⚡	lazy_map_lookup_3_50	51.6 µs	42.5 µs	+21.39%
❌	pass1_jiter_value	37.8 µs	45.2 µs	-16.42%
❌	true_object_jiter_value	31.8 µs	45.1 µs	-29.45%
❌	python_parse_true_array	15.1 µs	16.9 µs	-10.77%

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.55814% with 16 lines in your changes missing coverage. Please review.

Project coverage is 95.09%. Comparing base (dd25fd0) to head (e054b28). Report is 38 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/jiter/src/lazy_index_map.rs	92.38%	16 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   94.91%   95.09%   +0.18%     
==========================================
  Files          12       12              
  Lines        1908     1999      +91     
==========================================
+ Hits         1811     1901      +90     
- Misses         97       98       +1     

Files with missing lines	Coverage Δ
crates/jiter/src/python.rs	98.55% <100.00%> (+1.54%)	:arrow_up:
crates/jiter/src/value.rs	97.10% <100.00%> (-0.02%)	:arrow_down:
crates/jiter/src/lazy_index_map.rs	93.36% <92.38%> (-4.62%)	:arrow_down:

... and 7 files with indirect coverage changes

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[davidhewitt]

Would be made irrelevant by #184