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We’ve been bitten before by symbol names changing: https://github.com/servo/heapsize/pull/46 and upstream is planning to stop using jemalloc by default: https://github.com/rust-lang/rust/issues/33082#issuecomment-309781465 So use the (relatively) new `#[global_allocator]` attribute to explicitly select the system allocator on Windows and jemalloc (now in an external crate) on other platforms. This choice matches current defaults.