build: support SymbolicUtils 4 / Symbolics 7#74
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* `substitute_all` now recurses into callable variable arguments by passing `filterer = _ -> true` to `SymbolicUtils.substitute`, matching the pre-SU 4 behaviour where `substitute(x(t), t => T)` reached inside `x(t)`. * `is_trig` compares the operation against `cos` / `sin` with `===` so that a callable variable head (e.g. `v1(T)`) no longer triggers symbolic `in`. * `my_isnan(::BasicSymbolic)` unwraps Const-wrapped numbers before calling `isnan`, so `hasnan` on a matrix of `Num(NaN)` returns `true` again. * Drop the now-unused `Symbolics.substitute` import.
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## main #74 +/- ##
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- Coverage 82.20% 81.80% -0.40%
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Files 10 10
Lines 500 511 +11
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+ Hits 411 418 +7
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substitute_allnow recurses into callable variable arguments by passingfilterer = _ -> truetoSymbolicUtils.substitute, matching the pre-SU 4 behaviour wheresubstitute(x(t), t => T)reached insidex(t).is_trigcompares the operation againstcos/sinwith===so that a callable variable head (e.g.v1(T)) no longer triggers symbolicin.my_isnan(::BasicSymbolic)unwraps Const-wrapped numbers before callingisnan, sohasnanon a matrix ofNum(NaN)returnstrueagain.Symbolics.substituteimport.Checklist
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