add type Int53

extra.js

@@ -39,7 +39,7 @@ function Range (a, b, f) {
   return _range
 }
 
-var UINT53_MAX = Math.pow(2, 53) - 1
+var INT53_MAX = Math.pow(2, 53) - 1
 
 function Finite (value) {
   return typeof value === 'number' && isFinite(value)
@@ -47,13 +47,19 @@ function Finite (value) {
 function Int8 (value) { return ((value << 24) >> 24) === value }
 function Int16 (value) { return ((value << 16) >> 16) === value }
 function Int32 (value) { return (value | 0) === value }
+function Int53 (value) {
+  return typeof value === 'number' &&
+    value >= -INT53_MAX &&
+    value <= INT53_MAX &&
+    Math.floor(value) === value
+}
 function UInt8 (value) { return (value & 0xff) === value }
 function UInt16 (value) { return (value & 0xffff) === value }
 function UInt32 (value) { return (value >>> 0) === value }
 function UInt53 (value) {
   return typeof value === 'number' &&
     value >= 0 &&
-    value <= UINT53_MAX &&
+    value <= INT53_MAX &&
     Math.floor(value) === value
 }
 
@@ -67,6 +73,7 @@ var types = {
   Int8: Int8,
   Int16: Int16,
   Int32: Int32,
+  Int53: Int53,
   Range: Range,
   StringN: _StringN,
   UInt8: UInt8,

scripts/generate_tests.js

@@ -61,6 +61,8 @@ const VALUES2 = [
   { a: 'foo', b: { c: 'bar' } }
 ]
 
+const INT53_MAX = Math.pow(2, 53) - 1
+
 // extra
 const VALUESX = [
   'fff',
@@ -77,8 +79,10 @@ const VALUESX = [
   0xffff,
   0x10000,
   0xffffffff,
-  9007199254740991,
+  INT53_MAX,
-  9007199254740994
+  INT53_MAX + 3,
+  -INT53_MAX,
+  -INT53_MAX - 3
 ]
 
 const fixtures = {

test/types.js

@@ -44,6 +44,7 @@ module.exports = {
   'Int8': typeforce.Int8,
   'Int16': typeforce.Int16,
   'Int32': typeforce.Int32,
+  'Int53': typeforce.Int53,
   'UInt8': typeforce.UInt8,
   'UInt16': typeforce.UInt16,
   'UInt32': typeforce.UInt32,