limit( (2*x+a)/(x+a), x, 0) always returns 1, without asking whether a=0 (in which case the correct result is 2).
limit( (2*x+a)/(x+a), x, 0)
Contributed by davewittemorris@sourceforge.
Tested in 5.46.0 / SBCL 2.2.5
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