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Chris Tate
091f280cec
`u === 0`, `u !== true` and `Object.is(u, x)` against a scalar arm tested the union's tag inline but read its payload through scr_union_get_f64 or scr_union_get_bool. The call passed the union's stack box to the runtime, so LLVM could not promote the box to registers, and an element read of a `number[]` compared with a number kept its value, tag and box in memory. The comparison now loads the payload slot directly, as other union extractions already do, and the box no longer escapes.