Fix scientific notation

index.js

@@ -68,6 +68,17 @@ function formatter(options) {
     overrideOptions = overrideOptions || {};
 
     if (number || number === 0) {
+      if (typeof number === 'number') {
+        //get rid of the possible "e-"
+        var parts = number.toString().split('e-');
+        if (parts.length === 2) {
+          var digits = (parts[0].replace('.', '').replace('-', '')).length - 1 + Number(parts[1]);
+          //maximum number of digits is 20
+          //see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toFixed
+          digits = digits > 20 ? 20 : digits;
+          number = number.toFixed(digits);
+        }
+      }
       number = '' + number;//convert number to string if it isn't already
     } else {
       return '';

test/index.js

@@ -502,3 +502,16 @@ describe('£68,932/items with no separators', function () {
     expect(formatFactory({prefix: '£', suffix: '/item'})(68932, {noSeparator: true})).to.be('£68932/item');
   });
 });
+
+//scientific notation
+describe('scientific notation', function() {
+  it('get rid of "e-"', function () {
+    expect(formatFactory()(1.23456e-10)).to.be('0.000000000123456');
+  });
+  it('round', function () {
+    expect(formatFactory({round: 2})(1.4551915228366852e-11)).to.be('0.00');
+  });
+  it('truncate', function () {
+    expect(formatFactory({truncate: 2})(1.29995068248398e-16)).to.be('0.00');
+  });
+});