the next f64 value after |val|, towards +inf or -inf as specified by |dir|.
If |mode| is 'flush', all subnormal values will be flushed to 0, before processing and for -/+0 the nextAfterF64 will be the closest normal in the correct direction.
If |mode| is 'no-flush', the next subnormal will be calculated when appropriate, and for -/+0 the nextAfterF64 will be the closest subnormal in the correct direction.
val needs to be in [min f64, max f64]
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