Unexpected results for lighten and darken functions

[matt-cooper]

input.scss

.test-case {
  color: lighten(#333333, 10%);
  background-color: darken(#4d4d4d, 10%);
}

Existing behavior

Using:

  node-sass 3.13.1
  libsass   3.3.6

Expected output (matches SassMeister v3.4.21):

.test-case {
  color: #4d4d4d;
  background-color: #343434; }

New and unexpected behavior

Using:

  node-sass 4.2.0
  libsass   3.4.3

Unexpected output:

.test-case {
  color: #4d4c4c;
  background-color: #343333; }

[mgreter]

This is probably related to #2256. I have closed the previous issue report, since there is not much we can do about this. But I'll keep this open, as there maybe is a way to get this more closely to the original ruby sass implementation. Afterall the differences between those two colors are so minimal that probably nobody could make out a difference by eye anyway, so this is not a high prio issue.

[mgreter]

Closing as insignificant. The math for rounding floats can be tricky and I would argue that no human can really tell the difference between #343434 and #343333.