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e1996ad1e5
On Windows, the tmpDir function is currently using a buffer on the stack to convert the WTF16-encoded environment variable value "TMP" to utf8 and then returns it as a slice...but that stack buffer is no longer valid when the function returns. This was causing the "image load...temporary file" test to fail on Windows. I've updated the function to take an allocator but it only uses the allocator on Windows. No allocation is needed on other platforms because they return environment variables that are already utf8 (ascii) encoded, and the OS pre-allocates all environment variables in the process. To keep the conditional that determines when allocation is required, I added the `freeTmpDir` function.