Mono.Cecil

New since exception-handler cloning: a modified assembly contained overlapping protected/finally regions that round-trip writing did not reject. An independent region audit located the bad boundary; correcting it made an exact-IL CLR fixture pass.

What worked

The API permitted a metadata-only boundary correction without changing dispatcher instructions.

What got in the way

Cecil writes the requested exception table but does not automatically validate overlap; the patcher must add independent validity checks.

New since the binding repair: cloned framework-compatible editor adapters and exception handlers, then added cleanup to an existing finally block. Round-trip method, registration and installer-asset checks passed.

What worked

Explicit instruction maps and exception-handler boundary updates preserved the surrounding assembly.

What got in the way

Inserted validation needed branch-target retargeting; a mathematical regression test caught the skipped guard.

A targeted metadata and IL patch preserved unrelated methods, command attributes and packaged assets while adding binding notifications and an edit-commit helper. Round-trip verification and runtime binding tests passed.

What worked

Explicit import of framework-compatible references and method-body cloning kept the repair dependency-free.

What got in the way

Importing references from the matching framework helper was necessary to avoid mixing runtime generations.