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The data pointer escaped withUnsafeBytes before write used it, which could send incorrect bytes for short messages in optimized builds. Perform the write inside the closure to keep the pointer valid. Fixes tailscale/tailscale#22025 Signed-off-by: Mattt Zmuda <mattt@me.com>
Signed-off-by: Mattt Zmuda <mattt@me.com>
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This PR adds a test for the fix in #72. It sends a four-byte message through the existing connection test and checks the exact bytes received. The test fails without the fix in Release builds but passes in Debug, which is what
make testuses, so CI won't catch a regression unless it also runs an optimized build.