Avoid precision loss when converting between units. Fixes #330

2 files changed, 10 insertions, 0 deletions

diff --git a/scss/tests/files/bugs/unit-float-precision.css b/scss/tests/files/bugs/unit-float-precision.css
new file mode 100644
index 0000000..16e9d86
--- /dev/null
+++ b/scss/tests/files/bugs/unit-float-precision.css
@@ -0,0 +1,3 @@
+a {
+  width: 702px;
+}
diff --git a/scss/tests/files/bugs/unit-float-precision.scss b/scss/tests/files/bugs/unit-float-precision.scss
new file mode 100644
index 0000000..a57b294
--- /dev/null
+++ b/scss/tests/files/bugs/unit-float-precision.scss
@@ -0,0 +1,7 @@
+// A number of pixels is actually stored internally as millimeters, which
+// causes some slight precision issues in corner cases.  In this case, the
+// answer came out as 701px rather than 702px, because the subtraction yielded
+// 701.99999999px.
+a {
+    width: floor(742px - 40px);
+}