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Fix available memory reporting on macOS - #3299
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Only "Pages free" is required; a missing page-size header falls back to 4096 bytes and missing inactive/speculative counts are treated as zero, so a partial vm_stat output no longer drops the available value. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
timcassell
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vm_stat, including 16 KiB pages on Apple Silicon.Fixes #3287. The previous implementation reported only
Pages free, which understated available memory on macOS systems where reusable pages make up a substantial portion of memory.