Simplified raw memory access helpers

Sources/Bytes/Colletion+Casting.swift

@@ -39,21 +39,17 @@ extension BidirectionalCollection where Element == Byte {
     public func casting<R>() throws -> R {
         try canBeCasted(to: R.self)
 
-        guard
-            let result = self.withContiguousStorageIfAvailable({
-                $0.withUnsafeBytes {
-                    $0.baseAddress!.assumingMemoryBound(to: R.self).pointee
-                }
-            })
-        else {
-            guard self.count <= 4*1024 else { // If bytes is less than 4KB, then perform a copy first
-                throw BytesError.contiguousMemoryUnavailable(type: "\(Self.self)")
-            }
-            return Bytes(self).withUnsafeBytes {
-                $0.baseAddress!.assumingMemoryBound(to: R.self).pointee
-            }
+        if let result = self.withContiguousStorageIfAvailable({
+            $0.withUnsafeBytes { $0.loadUnaligned(as: R.self) }
+        }) {
+            return result
         }
-        return result
+
+        /// If bytes is less than 4KB, then perform a copy first
+        guard self.count <= 4*1024
+        else { throw BytesError.contiguousMemoryUnavailable(type: "\(Self.self)") }
+
+        return Bytes(self).withUnsafeBytes { $0.loadUnaligned(as: R.self) }
     }
 
     /// Create a new Bytes sequence from the memory occupied by the passed in value.

Tests/BytesTests/IntegerTests.swift

@@ -32,6 +32,12 @@ final class IntegerTests: XCTestCase {
         XCTAssertEqual(try Int64(littleEndianBytes: [0x11, 0x32, 0x54, 0x76, 0x98, 0xba, 0xdc, 0xfe]), Int64(-0x0123456789abcdef))
     }
 
+    func testUnalignedMemoryAccess() throws {
+        let bytes: Bytes = [0x0, 0x0, 0x0, 0x01, 0x23, 0x45, 0x67, 0x0]
+
+        XCTAssertEqual(try UInt32(bigEndianBytes: bytes.dropFirst(3).dropLast()), UInt32(0x01234567))
+    }
+
     func testInvalidBytes() throws {
         XCTAssertThrowsError(try UInt8(bigEndianBytes: [])) {
             BytesError.testInvalidMemorySize($0, targetSize: 1, targetType: "UInt8", actualSize: 0)