handle negative zero; fixes #921

1 files changed, 3 insertions, 1 deletions

diff --git a/src/parseTools.js b/src/parseTools.js
index 2664baed..9fddacbb 100644
--- a/src/parseTools.js
+++ b/src/parseTools.js
@@ -818,7 +818,9 @@ function parseNumerical(value, type) {
     return '0';
   }
   if (isNumber(value)) {
-    return parseFloat(value).toString(); // will change e.g. 5.000000e+01 to 50
+    var ret = parseFloat(value); // will change e.g. 5.000000e+01 to 50
+    if (type in Runtime.FLOAT_TYPES && value[0] == '-' && ret === 0) return '-0'; // fix negative 0, toString makes it 0
+    return ret.toString();
   } else {
     return value;
   }