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The original clamping bounds on `_x` actually produce finite values: ``` exp(88.3762626647950) = 2.40614e+38 < 3.40282e+38 exp(709.437) = 1.27226e+308 < 1.79769e+308 ``` so with an accurate `ldexp` implementation, `pexp` fails for large inputs, producing finite values instead of `inf`. This adjusts the bounds slightly outside the finite range so that the output will overflow to +/- `inf` as expected.