ReadExactly​(AngouriMath.​Entity)

With the downcasting off, a whole number parses as a decimal, so x^2 is not a
whole power to the integrator, and the zero test reads no literal zero as zero:
integration gave NaN for (a + b arcsin(c x))/sqrt(d - c^2 d x^2) and
limits gave it for sin(c x)/x at 0, where the default setting answers. Both are
computed as with the downcasting on, on the exact values the decimals hold, so that
the answer does not depend on the setting. The cost is that decimals come back as
rationals: the integral of 0.1 x is x^2/20.
https://github.com/asc-community/AngouriMath/issues/1490