[nostalgia/developer-handbook] Update notes on error handling

developer-handbook.md

@@ -162,18 +162,10 @@ classes in question.
 
 ### Error Handling
 
-Exceptions are clean and nice in userland code running in environments with
-expansive system resources, but they are a bit of a pain in small bare metal
-environments.
-The GBA build has them disabled.
-Exceptions cause also the compiler to generate a great deal of extra code that
-inflates the size of the binary.
-The binary size bloat is often cited as one of the main reasons why many
-embedded developers prefer C to C++.
-
-Instead of throwing exceptions, all engine code must return Ox error codes.
-For the sake of consistency, try to stick to Ox error codes in non-engine code
-as well.
+The GBA build has exceptions disabled.
+Instead of throwing exceptions, all engine code must return ```ox::Error```s.
+For the sake of consistency, try to stick to ```ox::Error``` in non-engine code
+as well, but non-engine code is free to use exceptions when they make sense.
 Nostalgia and Ox both use ```ox::Error``` to report errors. ```ox::Error``` is
 a struct that has overloaded operators to behave like an integer error code,
 plus some extra fields to enhance debuggability.
@@ -219,6 +211,22 @@ int caller2() {
 	std::cout << val << '\n';
 	return 0;
 }
+
+ox::Error caller3(int &i) {
+    return foo(i).moveTo(i);
+}
+
+ox::Error caller4(int &i) {
+    return foo(i).copyTo(i);
+}
+
+int caller5(int i) {
+    return foo(i).unwrap(); // unwrap will kill the program if there is an error
+}
+
+int caller6(int i) {
+    return foo(i).unwrapThrow(); // unwrap will throw if there is an error
+}
 ```
 
 Lastly, there are a few macros available to help in passing ```ox::Error```s
@@ -275,6 +283,7 @@ ox::Error engineCode() noexcept {
 	return OxError(0);
 }
 ```
+
 Ox also has the ```oxRequire``` macro, which will initialize a value if there is no error, and return if there is.
 It aims to somewhat emulate the ```?``` operator in Rust and Swift.
 
@@ -309,6 +318,9 @@ ox::Result<int> f2() noexcept {
 * ```oxRequireT``` - oxRequire Throw
 * ```oxRequireMT``` - oxRequire Mutable Throw
 
+The throw variants of ```oxRequire``` are generally legacy code.
+```ox::Result::unwrapThrow``` is generally preferred now.
+
 ### Logging and Output
 
 Ox provides for logging and debug prints via the ```oxTrace```, ```oxDebug```, and ```oxError``` macros.