diff --git a/decimal.js b/decimal.js
index 46358fc..23cc2d3 100644
--- a/decimal.js
+++ b/decimal.js
@@ -3,7 +3,7 @@
 
 
   /*
-   *  decimal.js v10.1.1
+   *  decimal.js v10.2.0
    *  An arbitrary-precision Decimal type for JavaScript.
    *  https://github.com/MikeMcl/decimal.js
    *  Copyright (c) 2019 Michael Mclaughlin <M8ch88l@gmail.com>
@@ -4341,10 +4341,12 @@
       }
 
       // Minus sign?
-      if (v.charCodeAt(0) === 45) {
+      if ((i = v.charCodeAt(0)) === 45) {
         v = v.slice(1);
         x.s = -1;
       } else {
+        // Plus sign?
+        if (i === 43) v = v.slice(1);
         x.s = 1;
       }
 
@@ -4461,6 +4463,8 @@
    *
    * hypot(a, b, ...) = sqrt(a^2 + b^2 + ...)
    *
+   * arguments {number|string|Decimal}
+   *
    */
   function hypot() {
     var i, n,
@@ -4735,6 +4739,8 @@
    *  -0    if x is -0,
    *   NaN  otherwise
    *
+   * x {number|string|Decimal}
+   *
    */
   function sign(x) {
     x = new this(x);
diff --git a/decimal.mjs b/decimal.mjs
index 7948fad..ca5fcd2 100644
--- a/decimal.mjs
+++ b/decimal.mjs
@@ -1,5 +1,5 @@
 /*
- *  decimal.js v10.1.1
+ *  decimal.js v10.2.0
  *  An arbitrary-precision Decimal type for JavaScript.
  *  https://github.com/MikeMcl/decimal.js
  *  Copyright (c) 2019 Michael Mclaughlin <M8ch88l@gmail.com>
@@ -3728,7 +3728,7 @@ function tinyPow(b, e) {
   var n = b;
   while (--e) n *= b;
   return n;
-}                                             
+}
 
 
 // Return the absolute value of `x` reduced to less than or equal to half pi.
@@ -4337,10 +4337,12 @@ function clone(obj) {
     }
 
     // Minus sign?
-    if (v.charCodeAt(0) === 45) {
+    if ((i = v.charCodeAt(0)) === 45) {
       v = v.slice(1);
       x.s = -1;
     } else {
+      // Plus sign?
+      if (i === 43) v = v.slice(1);
       x.s = 1;
     }
 
@@ -4457,6 +4459,8 @@ function floor(x) {
  *
  * hypot(a, b, ...) = sqrt(a^2 + b^2 + ...)
  *
+ * arguments {number|string|Decimal}
+ *
  */
 function hypot() {
   var i, n,
@@ -4731,6 +4735,8 @@ function round(x) {
  *  -0    if x is -0,
  *   NaN  otherwise
  *
+ * x {number|string|Decimal}
+ *
  */
 function sign(x) {
   x = new this(x);
diff --git a/test/modules/Decimal.js b/test/modules/Decimal.js
index 6d38237..24c5897 100644
--- a/test/modules/Decimal.js
+++ b/test/modules/Decimal.js
@@ -124,6 +124,7 @@ T('Decimal', function () {
   t('0', '0b0');
   t('0', '0B0');
   t('-5', '-0b101');
+  t('5', '+0b101');
   t('1.5', '0b1.1');
   t('-1.5', '-0b1.1');
 
@@ -139,6 +140,7 @@ T('Decimal', function () {
   // Octal.
   t('8', '0o10');
   t('-8.5', '-0O010.4');
+  t('8.5', '+0O010.4');
   t('-262144.000000059604644775390625', '-0o1000000.00000001');
   t('572315667420.390625', '0o10250053005734.31');
 
@@ -146,6 +148,7 @@ T('Decimal', function () {
   t('1', '0x00001');
   t('255', '0xff');
   t('-15.5', '-0Xf.8');
+  t('15.5', '+0Xf.8');
   t('-16777216.00000000023283064365386962890625', '-0x1000000.00000001');
   t('325927753012307620476767402981591827744994693483231017778102969592507', '0xc16de7aa5bf90c3755ef4dea45e982b351b6e00cd25a82dcfe0646abb');
 
@@ -156,14 +159,18 @@ T('Decimal', function () {
   }
 
   t('NaN', NaN);
+  t('NaN', -NaN);
   t('NaN', 'NaN');
   t('NaN', '-NaN');
+  t('NaN', '+NaN');
 
   tx(function () {new Decimal(' NaN')}, "' NaN'");
   tx(function () {new Decimal('NaN ')}, "'NaN '");
   tx(function () {new Decimal(' NaN ')}, "' NaN '");
-  tx(function () {new Decimal('+NaN')}, "'+NaN'");
+  tx(function () {new Decimal(' -NaN')}, "' -NaN'");
   tx(function () {new Decimal(' +NaN')}, "' +NaN'");
+  tx(function () {new Decimal('-NaN ')}, "'-NaN '");
+  tx(function () {new Decimal('+NaN ')}, "'+NaN '");
   tx(function () {new Decimal('.NaN')}, "'.NaN'");
   tx(function () {new Decimal('NaN.')}, "'NaN.'");
 
@@ -171,11 +178,12 @@ T('Decimal', function () {
   t('-Infinity', -Infinity);
   t('Infinity', 'Infinity');
   t('-Infinity', '-Infinity');
+  t('Infinity', '+Infinity');
 
   tx(function () {new Decimal(' Infinity')}, "' Infinity '");
   tx(function () {new Decimal('Infinity ')}, "'Infinity '");
   tx(function () {new Decimal(' Infinity ')}, "' Infinity '");
-  tx(function () {new Decimal('+Infinity')}, "'+Infinity'");
+  tx(function () {new Decimal(' -Infinity')}, "' -Infinity'");
   tx(function () {new Decimal(' +Infinity')}, "' +Infinity'");
   tx(function () {new Decimal('.Infinity')}, "'.Infinity'");
   tx(function () {new Decimal('Infinity.')}, "'Infinity.'");
@@ -197,7 +205,7 @@ T('Decimal', function () {
   tx(function () {new Decimal('0-')}, "'0-'");
   tx(function () {new Decimal(' -0')}, "' -0'");
   tx(function () {new Decimal('-0 ')}, "'-0 '");
-  tx(function () {new Decimal('+0')}, "'+0'");
+  tx(function () {new Decimal('+0 ')}, "'+0 '");
   tx(function () {new Decimal(' +0')}, "' +0'");
   tx(function () {new Decimal(' .0')}, "' .0'");
   tx(function () {new Decimal('0. ')}, "'0. '");
@@ -222,12 +230,16 @@ T('Decimal', function () {
   t('0.1', '.1');
   t('0.1', '.1');
   t('-0.1', '-.1');
+  t('0.1', '+.1');
   t('1', '1.');
   t('1', '1.0');
   t('-1', '-1.');
+  t('1', '+1.');
   t('-1', '-1.0000');
+  t('1', '1.0000');
   t('1', '1.00000000');
   t('-1', '-1.000000000000000000000000');
+  t('1', '+1.000000000000000000000000');
 
   tx(function () {new Decimal(' 1')}, "' 1'");
   tx(function () {new Decimal('1 ')}, "'1 '");
@@ -235,8 +247,8 @@ T('Decimal', function () {
   tx(function () {new Decimal('1-')}, "'1-'");
   tx(function () {new Decimal(' -1')}, "' -1'");
   tx(function () {new Decimal('-1 ')}, "'-1 '");
-  tx(function () {new Decimal('+1')}, "'+1'");
   tx(function () {new Decimal(' +1')}, "' +1'");
+  tx(function () {new Decimal('+1 ')}, "'+1'");
   tx(function () {new Decimal('.1.')}, "'.1.'");
   tx(function () {new Decimal('+-1')}, "'+-1'");
   tx(function () {new Decimal('-+1')}, "'-+1'");
@@ -262,8 +274,9 @@ T('Decimal', function () {
 
   t('123.456789', 123.456789);
   t('-123.456789', -123.456789);
-  t('123.456789', '123.456789');
   t('-123.456789', '-123.456789');
+  t('123.456789', '123.456789');
+  t('123.456789', '+123.456789');
 
   tx(function () {new Decimal(void 0)}, "void 0");
   tx(function () {new Decimal('undefined')}, "'undefined'");
@@ -282,7 +295,9 @@ T('Decimal', function () {
   tx(function () {new Decimal('ff')}, "'ff'");
   tx(function () {new Decimal('0xg')}, "'oxg'");
   tx(function () {new Decimal('0Xfi')}, "'0Xfi'");
+  tx(function () {new Decimal('++45')}, "'++45'");
   tx(function () {new Decimal('--45')}, "'--45'");
   tx(function () {new Decimal('9.99--')}, "'9.99--'");
+  tx(function () {new Decimal('9.99++')}, "'9.99++'");
   tx(function () {new Decimal('0 0')}, "'0 0'");
 });