diff --git a/Sources/MessagePack/ConvenienceProperties.swift b/Sources/MessagePack/ConvenienceProperties.swift
index 45e8b46..d12fcad 100644
--- a/Sources/MessagePack/ConvenienceProperties.swift
+++ b/Sources/MessagePack/ConvenienceProperties.swift
@@ -43,7 +43,10 @@ extension MessagePackValue {
         }
     }
 
-    /// The integer value if `.Int` or an appropriately valued `.UInt`, `nil` otherwise.
+    // MARK: Signed integer values
+
+    /// The integer value if `.int` or an appropriately valued `.uint`, `nil` otherwise.
+    @available(*, deprecated, message: "use int64Value: instead")
     public var integerValue: Int64? {
         switch self {
         case .int(let value):
@@ -55,7 +58,75 @@ extension MessagePackValue {
         }
     }
 
-    /// The unsigned integer value if `.UInt` or positive `.Int`, `nil` otherwise.
+    /// The signed platform-dependent width integer value if `.int` or an
+    /// appropriately valued `.uint`, `nil` otherwise.
+    public var intValue: Int? {
+        switch self {
+        case .int(let value):
+            return Int(exactly: value)
+        case .uint(let value):
+            return Int(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The signed 8-bit integer value if `.int` or an appropriately valued
+    /// `.uint`, `nil` otherwise.
+    public var int8Value: Int8? {
+        switch self {
+        case .int(let value):
+            return Int8(exactly: value)
+        case .uint(let value):
+            return Int8(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The signed 16-bit integer value if `.int` or an appropriately valued
+    /// `.uint`, `nil` otherwise.
+    public var int16Value: Int16? {
+        switch self {
+        case .int(let value):
+            return Int16(exactly: value)
+        case .uint(let value):
+            return Int16(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The signed 32-bit integer value if `.int` or an appropriately valued
+    /// `.uint`, `nil` otherwise.
+    public var int32Value: Int32? {
+        switch self {
+        case .int(let value):
+            return Int32(exactly: value)
+        case .uint(let value):
+            return Int32(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The signed 64-bit integer value if `.int` or an appropriately valued
+    /// `.uint`, `nil` otherwise.
+    public var int64Value: Int64? {
+        switch self {
+        case .int(let value):
+            return value
+        case .uint(let value):
+            return Int64(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    // MARK: Unsigned integer values
+
+    /// The unsigned integer value if `.uint` or positive `.int`, `nil` otherwise.
+    @available(*, deprecated, message: "use uint64Value: instead")
     public var unsignedIntegerValue: UInt64? {
         switch self {
         case .int(let value) where value >= 0:
@@ -67,6 +138,71 @@ extension MessagePackValue {
         }
     }
 
+    /// The unsigned platform-dependent width integer value if `.uint` or an
+    /// appropriately valued `.int`, `nil` otherwise.
+    public var uintValue: UInt? {
+        switch self {
+        case .int(let value):
+            return UInt(exactly: value)
+        case .uint(let value):
+            return UInt(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The unsigned 8-bit integer value if `.uint` or an appropriately valued
+    /// `.int`, `nil` otherwise.
+    public var uint8Value: UInt8? {
+        switch self {
+        case .int(let value):
+            return UInt8(exactly: value)
+        case .uint(let value):
+            return UInt8(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The unsigned 16-bit integer value if `.uint` or an appropriately valued
+    /// `.int`, `nil` otherwise.
+    public var uint16Value: UInt16? {
+        switch self {
+        case .int(let value):
+            return UInt16(exactly: value)
+        case .uint(let value):
+            return UInt16(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The unsigned 32-bit integer value if `.uint` or an appropriately valued
+    /// `.int`, `nil` otherwise.
+    public var uint32Value: UInt32? {
+        switch self {
+        case .int(let value):
+            return UInt32(exactly: value)
+        case .uint(let value):
+            return UInt32(exactly: value)
+        default:
+            return nil
+        }
+    }
+
+    /// The unsigned 64-bit integer value if `.uint` or an appropriately valued
+    /// `.int`, `nil` otherwise.
+    public var uint64Value: UInt64? {
+        switch self {
+        case .int(let value):
+            return UInt64(exactly: value)
+        case .uint(let value):
+            return value
+        default:
+            return nil
+        }
+    }
+
     /// The contained array if `.Array`, `nil` otherwise.
     public var arrayValue: [MessagePackValue]? {
         switch self {
@@ -93,7 +229,7 @@ extension MessagePackValue {
         case .float(let value):
             return value
         case .double(let value):
-            return Float(value)
+          return Float(exactly: value)
         default:
             return nil
         }
@@ -103,7 +239,7 @@ extension MessagePackValue {
     public var doubleValue: Double? {
         switch self {
         case .float(let value):
-            return Double(value)
+            return Double(exactly: value)
         case .double(let value):
             return value
         default:
diff --git a/Tests/MessagePackTests/ConveniencePropertiesTests.swift b/Tests/MessagePackTests/ConveniencePropertiesTests.swift
index 2964d19..707ad2e 100644
--- a/Tests/MessagePackTests/ConveniencePropertiesTests.swift
+++ b/Tests/MessagePackTests/ConveniencePropertiesTests.swift
@@ -9,8 +9,16 @@ class ConveniencePropertiesTests: XCTestCase {
             ("testIndexedSubscript", testIndexedSubscript),
             ("testKeyedSubscript", testKeyedSubscript),
             ("testIsNil", testIsNil),
-            ("testIntegerValue", testIntegerValue),
-            ("testUnsignedIntegerValue", testUnsignedIntegerValue),
+            ("testIntValue", testIntValue),
+            ("testInt8Value", testInt8Value),
+            ("testInt16Value", testInt16Value),
+            ("testIn32Value", testInt32Value),
+            ("testInt64Value", testInt64Value),
+            ("testUIntValue", testUIntValue),
+            ("testUInt8Value", testUInt8Value),
+            ("testUInt16Value", testUInt16Value),
+            ("testUInt32Value", testUInt32Value),
+            ("testUInt64Value", testUInt64Value),
             ("testArrayValue", testArrayValue),
             ("testBoolValue", testBoolValue),
             ("testFloatValue", testFloatValue),
@@ -46,17 +54,98 @@ class ConveniencePropertiesTests: XCTestCase {
         XCTAssertFalse(MessagePackValue.bool(true).isNil)
     }
 
-    func testIntegerValue() {
-        XCTAssert(MessagePackValue.int(-1).integerValue == -1)
-        XCTAssert(MessagePackValue.uint(1).integerValue == 1)
-        XCTAssert(MessagePackValue.nil.integerValue == nil)
+    func testIntValue() {
+        XCTAssert(MessagePackValue.int(-1).intValue == -1)
+        XCTAssert(MessagePackValue.uint(1).intValue == 1)
+        XCTAssertNil(MessagePackValue.nil.intValue)
     }
 
-    func testUnsignedIntegerValue() {
-        XCTAssert(MessagePackValue.int(-1).unsignedIntegerValue == nil)
-        XCTAssert(MessagePackValue.int(1).unsignedIntegerValue == 1)
-        XCTAssert(MessagePackValue.uint(1).unsignedIntegerValue == 1)
-        XCTAssert(MessagePackValue.nil.unsignedIntegerValue == nil)
+    func testInt8Value() {
+        XCTAssert(MessagePackValue.int(-1).int8Value == -1)
+        XCTAssert(MessagePackValue.int(1).int8Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(Int8.min) - 1).int8Value)
+        XCTAssertNil(MessagePackValue.int(Int64(Int8.max) + 1).int8Value)
+
+        XCTAssert(MessagePackValue.uint(1).int8Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(Int8.max) + 1).int8Value)
+        XCTAssertNil(MessagePackValue.nil.int8Value)
+    }
+
+    func testInt16Value() {
+        XCTAssert(MessagePackValue.int(-1).int16Value == -1)
+        XCTAssert(MessagePackValue.int(1).int16Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(Int16.min) - 1).int16Value)
+        XCTAssertNil(MessagePackValue.int(Int64(Int16.max) + 1).int16Value)
+
+        XCTAssert(MessagePackValue.uint(1).int16Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(Int16.max) + 1).int16Value)
+        XCTAssertNil(MessagePackValue.nil.int16Value)
+    }
+
+    func testInt32Value() {
+        XCTAssert(MessagePackValue.int(-1).int32Value == -1)
+        XCTAssert(MessagePackValue.int(1).int32Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(Int32.min) - 1).int32Value)
+        XCTAssertNil(MessagePackValue.int(Int64(Int32.max) + 1).int32Value)
+
+        XCTAssert(MessagePackValue.uint(1).int32Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(Int32.max) + 1).int32Value)
+        XCTAssertNil(MessagePackValue.nil.int32Value)
+    }
+
+    func testInt64Value() {
+        XCTAssert(MessagePackValue.int(-1).int64Value == -1)
+        XCTAssert(MessagePackValue.int(1).int64Value == 1)
+
+        XCTAssert(MessagePackValue.uint(1).int64Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(Int64.max) + 1).int64Value)
+        XCTAssertNil(MessagePackValue.nil.int64Value)
+    }
+
+    func testUIntValue() {
+        XCTAssert(MessagePackValue.uint(1).uintValue == 1)
+
+        XCTAssertNil(MessagePackValue.int(-1).uintValue)
+        XCTAssert(MessagePackValue.int(1).uintValue == 1)
+        XCTAssertNil(MessagePackValue.nil.uintValue)
+    }
+
+    func testUInt8Value() {
+        XCTAssert(MessagePackValue.uint(1).uint8Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(UInt8.max) + 1).uint8Value)
+
+        XCTAssertNil(MessagePackValue.int(-1).uint8Value)
+        XCTAssert(MessagePackValue.int(1).uint8Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(UInt8.max) + 1).uint8Value)
+        XCTAssertNil(MessagePackValue.nil.uint8Value)
+    }
+
+    func testUInt16Value() {
+        XCTAssert(MessagePackValue.uint(1).uint16Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(UInt16.max) + 1).uint16Value)
+
+        XCTAssertNil(MessagePackValue.int(-1).uint16Value)
+        XCTAssert(MessagePackValue.int(1).uint16Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(UInt16.max) + 1).uint16Value)
+        XCTAssertNil(MessagePackValue.nil.uint16Value)
+    }
+
+    func testUInt32Value() {
+        XCTAssert(MessagePackValue.uint(1).uint32Value == 1)
+        XCTAssertNil(MessagePackValue.uint(UInt64(UInt32.max) + 1).uint32Value)
+
+        XCTAssertNil(MessagePackValue.int(-1).uint32Value)
+        XCTAssert(MessagePackValue.int(1).uint32Value == 1)
+        XCTAssertNil(MessagePackValue.int(Int64(UInt32.max) + 1).uint32Value)
+        XCTAssertNil(MessagePackValue.nil.uint32Value)
+    }
+
+    func testUInt64Value() {
+        XCTAssert(MessagePackValue.uint(1).uint64Value == 1)
+
+        XCTAssertNil(MessagePackValue.int(-1).uint64Value)
+        XCTAssert(MessagePackValue.int(1).uint64Value == 1)
+        XCTAssertNil(MessagePackValue.nil.uint8Value)
     }
 
     func testArrayValue() {
@@ -80,8 +169,7 @@ class ConveniencePropertiesTests: XCTestCase {
         XCTAssertEqual(floatValue!, 3.14, accuracy: 0.0001)
 
         floatValue = MessagePackValue.double(3.14).floatValue
-        XCTAssertNotNil(floatValue)
-        XCTAssertEqual(floatValue!, 3.14, accuracy: 0.0001)
+        XCTAssertNil(floatValue)
     }
 
     func testDoubleValue() {