features.json: watr supports half precision as of 5.8.0 - #559
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Marks half precision as supported by watr since v5.8.0.
Covers the full instruction set from the proposal Overview:
f32.load_f16/f32.store_f16, allf16x8.*lane/arithmetic/comparison/conversion ops,f16x8.madd/nmadd, and(v128.const f16x8 ...)with exact round-to-nearest-even binary16 literal encoding. Opcodes follow V8 (--experimental-wasm-fp16); output is differentially tested against V8 validation,Float16Arrayarithmetic, andDataView.setFloat16in test/half-precision.js.