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  "title": "Add fabs support to Taylor series expander",
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  "body_excerpt": "This PR adds support for `fabs` in the Taylor expander. It thus fixes #1271. Specifically, `(fabs (+ x 1))` expands to `(+ 1 x)`; `(fabs (- x 1))` expands to `(+ 1 (neg x))` (it gets negated because the constant term is positive); and finally, terms like `(fabs (+ x (* x x))` expands to `(+ (fabs x)",
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