Calvin Buckley authored Aug 13, 2020 and Albert Astals Cid committed Aug 20, 2020

xdebug used to emit negative costs, but no longer does. Many
versions and oputput files still in the wild that do have negative
costs still exist, however, and KCG was often hanging writing to
stderr about garbage at the end of the line (the negative cost it
couldn't parse as unsigned) when loading files. This checks for
those and if so, clamps to zero, speeding up load times.

See: xdebug commit hash 688c552e620dc5be7eea22cb893c6b71f395c6d4