moonbitlang / core / 7225

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fix(math): clear the low bits of df in acosf

musl and FreeBSD acosf clear the low 12 bits of df = sqrt(z) for
x > 0.5, so that df*df is exact and c = (z - df*df)/(s + df) is the true
correction term. The port used df = s unchanged, the Float counterpart
of the acos line restored in #4359.

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