RFC: Expand derivatives in initialization equations before dummy derivative mapping #3211
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…vative mapping This handles cases like `D(-x) ~ 0` which can happen during the fixed point substitution The issue though is that if we have `D(y) ~ 0`, `y ~ -x`, then we need to substitute `D(-x) ~ 0` then change to `-D(x) ~ 0` and then substitute, so we need to somehow know to expand in the middle there.
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This handles cases like
D(-x) ~ 0which can happen during the fixed point substitutionThe issue though is that if we have
D(y) ~ 0,y ~ -x, then we need to substituteD(-x) ~ 0then change to-D(x) ~ 0and then substitute, so we need to somehow know to expand in the middle there.