Bun fixes DNS, fetch, Windows paths, and GC safety

Fix Windows over-long path conversion to UTF-16 (43fff14)

Bun now guards UTF-8→UTF-16 conversion buffers instead of assuming they fit, preventing a crash when extremely long Windows paths are converted for node:fs. The fix adds checked conversion paths and regression coverage for the 49k+ character range that previously panicked.

Harden DNS lookup/resolve for UTF-16 strings (d2a6506)

Bun.dns.lookupService and Bun.dns.resolve now convert string inputs through the UTF-16-safe slice path, avoiding a debug assertion when JS strings are backed by 16-bit storage. This closes a fuzzing crash and makes DNS argument handling work with strings from APIs like TextDecoder("utf-16le").

Treat empty compressed fetch bodies as empty (79b5471)

Fetch no longer tries to decompress a response that advertises gzip but sends zero body bytes, which previously surfaced as ZlibError. Empty compressed responses now resolve to an empty body, matching Node and fixing a real interoperability bug.

Collapse single-return arrow bodies during minification (800c0e5)

The bundler now rewrites arrows like { return a + b } into expression bodies when minifying syntax, producing shorter output that matches other tooling. The change is gated so runtime transpilation and Function.prototype.toString() behavior stay unchanged.

Fix type confusion in generated class custom setters (5d9b84a)

Generated DOM-style setter wrappers now verify the receiver type before downcasting, instead of blindly assuming the this value is the expected class instance. That prevents heap corruption when setters are invoked through proxies, prototype tricks, or extracted accessor functions.

Stub process.execve inside the Fuzzilli REPRL wrapper (40d8c4e)

The fuzzing REPRL harness now replaces process.execve with a no-op so fuzz cases can’t terminate the child process by design. That keeps deterministic fuzz runs from being misclassified as crashes while still testing the wrapper logic.

Fix resolver filename-store overflow under --bun (a587949)

Bun’s resolver intern pool and related overflow list sizing were adjusted to avoid a panic once the filename store grows past the old hard limit. This removes a --bun-specific crash path that could be triggered by heavy resolution workloads.

Other misc changes

• Removed stale TODO(port) comments and dead code across AST, bundler, and core modules (bf70cc7).
• Misc internal cleanup and test-only adjustments around the high-impact fixes above.