Index: src/OFNumber.m
==================================================================
--- src/OFNumber.m
+++ src/OFNumber.m
@@ -743,29 +743,15 @@
 			value.uintmax = [element decimalValue];
 		} else if ([typeString isEqual: @"signed"]) {
 			type = OF_NUMBER_INTMAX;
 			value.intmax = [element decimalValue];
 		} else if ([typeString isEqual: @"float"]) {
-			union {
-				float f;
-				uint32_t i;
-			} f;
-
 			type = OF_NUMBER_FLOAT;
-			f.i = (uint32_t)[[element stringValue]
-			    hexadecimalValue];
-			value.float_ = f.f;
+			value.float_ = [element floatValue];
 		} else if ([typeString isEqual: @"double"]) {
-			union {
-				double d;
-				uint64_t i;
-			} d;
-
 			type = OF_NUMBER_DOUBLE;
-			d.i = (uint64_t)[[element stringValue]
-			    hexadecimalValue];
-			value.double_ = d.d;
+			value.double_ = [element doubleValue];
 		} else
 			@throw [OFInvalidArgumentException newWithClass: isa
 							       selector: _cmd];
 
 		[pool release];
@@ -956,35 +942,42 @@
 }
 
 - (uint32_t)hash
 {
 	uint32_t hash;
+	uint8_t i;
 
 	switch (type) {
 	case OF_NUMBER_FLOAT:;
 		union {
 			float f;
-			uint32_t i;
+			uint8_t b[sizeof(float)];
 		} f;
 
 		f.f = of_bswap_float_if_le(value.float_);
 
 		OF_HASH_INIT(hash);
-		OF_HASH_ADD_INT32(hash, f.i);
+
+		for (i = 0; i < sizeof(float); i++)
+			OF_HASH_ADD(hash, f.b[i]);
+
 		OF_HASH_FINALIZE(hash);
 
 		return hash;
 	case OF_NUMBER_DOUBLE:;
 		union {
 			double d;
-			uint64_t i;
+			uint8_t b[sizeof(double)];
 		} d;
 
 		d.d = of_bswap_double_if_le(value.double_);
 
 		OF_HASH_INIT(hash);
-		OF_HASH_ADD_INT64(hash, d.i);
+
+		for (i = 0; i < sizeof(double); i++)
+			OF_HASH_ADD(hash, d.b[i]);
+
 		OF_HASH_FINALIZE(hash);
 
 		return hash;
 	default:
 		return [self uInt32Value];
@@ -1215,35 +1208,21 @@
 	case OF_NUMBER_INTPTR:;
 		[element addAttributeWithName: @"type"
 				  stringValue: @"signed"];
 		break;
 	case OF_NUMBER_FLOAT:;
-		union {
-			float f;
-			uint32_t i;
-		} f;
-
-		f.f = value.float_;
-
 		[element addAttributeWithName: @"type"
 				  stringValue: @"float"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%" PRIX32, f.i]];
+		    [OFString stringWithFormat: @"%a", value.float_]];
 
 		break;
 	case OF_NUMBER_DOUBLE:;
-		union {
-			double d;
-			uint64_t i;
-		} d;
-
-		d.d = value.double_;
-
 		[element addAttributeWithName: @"type"
 				  stringValue: @"double"];
 		[element setStringValue:
-		    [OFString stringWithFormat: @"%" PRIX64, d.i]];
+		    [OFString stringWithFormat: @"%la", value.double_]];
 
 		break;
 	default:
 		@throw [OFInvalidFormatException newWithClass: isa];
 	}

Index: tests/OFSerializationTests.m
==================================================================
--- tests/OFSerializationTests.m
+++ tests/OFSerializationTests.m
@@ -44,10 +44,11 @@
 	OFDataArray *da = [OFDataArray dataArray];
 	OFString *s;
 
 	[a addObject: @"Qu\"xbar\ntest"];
 	[a addObject: [OFNumber numberWithInt: 1234]];
+	[a addObject: [OFNumber numberWithDouble: 1234.5678]];
 	[a addObject: [OFMutableString stringWithString: @"asd"]];
 	[a addObject: [OFDate dateWithTimeIntervalSince1970: 1234.5678]];
 
 	[d setObject: @"Hello"
 	      forKey: a];

Index: tests/serialization.xml
==================================================================
--- tests/serialization.xml
+++ tests/serialization.xml
@@ -1,8 +1,33 @@
 <?xml version='1.0' encoding='UTF-8'?>
 <serialization xmlns='https://webkeks.org/objfw/serialization' version='0'>
   <OFMutableDictionary>
+    <key>
+      <OFDataArray>MDEyMzQ1Njc4OTo7PEFCQ0RFRkdISklLTE1OT1BRUlNUVVZXWFla</OFDataArray>
+    </key>
+    <object>
+      <OFString>data</OFString>
+    </object>
+    <key>
+      <OFArray>
+        <OFString>Qu&quot;xbar
+test</OFString>
+        <OFNumber type='signed'>1234</OFNumber>
+        <OFNumber type='double'>0x1.34a456d5cfaadp+10</OFNumber>
+        <OFMutableString>asd</OFMutableString>
+        <OFDate>0x1.34a456d5cfaadp+10</OFDate>
+      </OFArray>
+    </key>
+    <object>
+      <OFString>Hello</OFString>
+    </object>
+    <key>
+      <OFString>Blub</OFString>
+    </key>
+    <object>
+      <OFString>B&quot;la</OFString>
+    </object>
     <key>
       <OFList>
         <OFString>Hello</OFString>
         <OFString>Wo&#xD;ld!
 How are you?</OFString>
@@ -65,31 +90,7 @@
       </OFList>
     </key>
     <object>
       <OFString>list</OFString>
     </object>
-    <key>
-      <OFDataArray>MDEyMzQ1Njc4OTo7PEFCQ0RFRkdISklLTE1OT1BRUlNUVVZXWFla</OFDataArray>
-    </key>
-    <object>
-      <OFString>data</OFString>
-    </object>
-    <key>
-      <OFArray>
-        <OFString>Qu&quot;xbar
-test</OFString>
-        <OFNumber type='signed'>1234</OFNumber>
-        <OFMutableString>asd</OFMutableString>
-        <OFDate>0x1.34a456d5cfaadp+10</OFDate>
-      </OFArray>
-    </key>
-    <object>
-      <OFString>Hello</OFString>
-    </object>
-    <key>
-      <OFString>Blub</OFString>
-    </key>
-    <object>
-      <OFString>B&quot;la</OFString>
-    </object>
   </OFMutableDictionary>
 </serialization>