Nuno Antunes enhanced the Guardsquare/proguard-core repository by improving the robustness of code injection within the AccumulatedCodeInjector component. He introduced array argument support through a new pushArgument helper, enabling the injector to handle primitive, string, and array arguments more reliably during bytecode manipulation. Using Java and Kotlin, Nuno focused on strengthening instrumentation by adding targeted tests that validated array handling in logging scenarios. This work addressed edge-case failures in production deployments, resulting in a more resilient code injection process. The contribution demonstrated depth in code injection and testing, delivering a focused, well-tested feature that improved the reliability of instrumentation.