fix: missing extraction of operators in SymbolicUtils convert

[MilesCranmer]

Fixes MilesCranmer/PySR#788

cc @RicardRC

[github-actions]

Benchmark Results

	master	e469bad...	master/e469badd493c6e...
eval/ComplexF32/evaluation	7.13 ± 0.58 ms	6.78 ± 0.58 ms	1.05
eval/ComplexF64/evaluation	10.1 ± 0.76 ms	10.3 ± 0.84 ms	0.99
eval/Float32/derivative	10.6 ± 0.78 ms	10.8 ± 0.95 ms	0.98
eval/Float32/derivative_turbo	10.6 ± 0.76 ms	10.8 ± 0.85 ms	0.984
eval/Float32/evaluation	2.61 ± 0.28 ms	2.59 ± 0.28 ms	1.01
eval/Float32/evaluation_bumper	0.559 ± 0.038 ms	0.584 ± 0.043 ms	0.958
eval/Float32/evaluation_turbo	0.515 ± 0.037 ms	0.51 ± 0.043 ms	1.01
eval/Float32/evaluation_turbo_bumper	0.531 ± 0.034 ms	0.582 ± 0.043 ms	0.912
eval/Float64/derivative	14.5 ± 0.8 ms	13.9 ± 0.71 ms	1.04
eval/Float64/derivative_turbo	14.7 ± 0.79 ms	13.7 ± 0.6 ms	1.08
eval/Float64/evaluation	3.12 ± 0.37 ms	3.07 ± 0.32 ms	1.02
eval/Float64/evaluation_bumper	1.15 ± 0.084 ms	1.24 ± 0.051 ms	0.923
eval/Float64/evaluation_turbo	0.955 ± 0.084 ms	0.978 ± 0.083 ms	0.977
eval/Float64/evaluation_turbo_bumper	1.11 ± 0.074 ms	1.23 ± 0.091 ms	0.907
utils/combine_operators/break_sharing	0.0352 ± 0.0018 ms	0.0389 ± 0.003 ms	0.906
utils/convert/break_sharing	25.9 ± 2.4 μs	25.2 ± 2.9 μs	1.03
utils/convert/preserve_sharing	0.0975 ± 0.0036 ms	0.0903 ± 0.0079 ms	1.08
utils/copy/break_sharing	25.5 ± 2.8 μs	26.5 ± 2.6 μs	0.962
utils/copy/preserve_sharing	0.0913 ± 0.0075 ms	0.0966 ± 0.0032 ms	0.945
utils/count_constant_nodes/break_sharing	8.58 ± 0.27 μs	7.68 ± 0.56 μs	1.12
utils/count_constant_nodes/preserve_sharing	0.0834 ± 0.0073 ms	0.0782 ± 0.0058 ms	1.07
utils/count_depth/break_sharing	8.5 ± 0.59 μs	8.95 ± 0.71 μs	0.95
utils/count_nodes/break_sharing	7.39 ± 0.62 μs	7.71 ± 0.44 μs	0.959
utils/count_nodes/preserve_sharing	0.0847 ± 0.0036 ms	0.0793 ± 0.0071 ms	1.07
utils/get_set_constants!/break_sharing	30.6 ± 3.1 μs	0.0332 ± 0.0036 ms	0.923
utils/get_set_constants!/preserve_sharing	0.162 ± 0.014 ms	0.171 ± 0.014 ms	0.951
utils/get_set_constants_parametric	0.0437 ± 0.0035 ms	0.041 ± 0.0036 ms	1.07
utils/has_constants/break_sharing	3.76 ± 0.27 μs	4.38 ± 0.36 μs	0.859
utils/has_operators/break_sharing	1.85 ± 0.14 μs	1.67 ± 0.14 μs	1.1
utils/hash/break_sharing	21.1 ± 1.7 μs	22.7 ± 1.8 μs	0.933
utils/hash/preserve_sharing	0.0901 ± 0.0073 ms	0.0948 ± 0.0077 ms	0.95
utils/index_constant_nodes/break_sharing	24.4 ± 0.96 μs	23.5 ± 2 μs	1.04
utils/index_constant_nodes/preserve_sharing	0.095 ± 0.0084 ms	0.0904 ± 0.0075 ms	1.05
utils/is_constant/break_sharing	4.09 ± 0.31 μs	3.99 ± 0.3 μs	1.03
utils/simplify_tree/break_sharing	0.155 ± 0.011 ms	0.163 ± 0.0054 ms	0.954
utils/simplify_tree/preserve_sharing	0.21 ± 0.017 ms	0.214 ± 0.014 ms	0.981
utils/string_tree/break_sharing	0.424 ± 0.029 ms	0.44 ± 0.025 ms	0.962
utils/string_tree/preserve_sharing	0.522 ± 0.033 ms	0.54 ± 0.036 ms	0.966
time_to_load	0.218 ± 0.001 s	0.215 ± 0.0047 s	1.01

[coveralls]

Pull Request Test Coverage Report for Build 12476502676

Details

• 12 of 13 (92.31%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.05%) to 95.602%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
ext/DynamicExpressionsSymbolicUtilsExt.jl	12	13	92.31%

Totals
Change from base Build 12435483943:	0.05%
Covered Lines:	2565
Relevant Lines:	2683

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💛 - Coveralls