fabs

import std.math.traits : isIdentical;

assert(isIdentical(fabs(0.0f), 0.0f));
assert(isIdentical(fabs(-0.0f), 0.0f));
assert(fabs(-10.0f) == 10.0f);

assert(isIdentical(fabs(0.0), 0.0));
assert(isIdentical(fabs(-0.0), 0.0));
assert(fabs(-10.0) == 10.0);

assert(isIdentical(fabs(0.0L), 0.0L));
assert(isIdentical(fabs(-0.0L), 0.0L));
assert(fabs(-10.0L) == 10.0L);