fix: better edge case handling and test suite improvements (#9)

Author: mootz12

Cargo.toml

@@ -12,4 +12,4 @@ keywords = ["no_std", "wasm"]
 rust-version = "1.89"
 
 [dependencies]
-soroban-sdk = { version = "23.0.2" }
+soroban-sdk = { version = "23" }