Use precision of ArbField or AcbField instead of Balls (#1483)

* Use precision of ArbField or AcbField instead of Balls * fix doctests
Nemocas · May 31, 2023 · 5300744 · 5300744
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diff --git a/docs/src/algebraic.md b/docs/src/algebraic.md
@@ -120,7 +120,7 @@ julia> RR = ArbField(64); RR(sqrt(QQBar(2)))
 [1.414213562373095049 +/- 3.45e-19]
 
 julia> CC = AcbField(32); CC(QQBar(-1) ^ (QQBar(1) // 4))
-[0.7071067812 +/- 1.35e-11] + [0.7071067812 +/- 1.35e-11]*im
+[0.707106781 +/- 2.74e-10] + [0.707106781 +/- 2.74e-10]*im
 ```
 
 ### Minimal polynomials, conjugates, and properties

diff --git a/src/calcium/qqbar.jl b/src/calcium/qqbar.jl
@@ -1295,7 +1295,7 @@ Convert `a` to a real ball with the precision of the parent field `R`.
 Throws if `a` is not a real number.
 """
 function (R::ArbField)(a::qqbar)
-   prec = precision(Balls)
+   prec = precision(R)
    z = R()
    ccall((:qqbar_get_arb, libcalcium),
         Nothing, (Ref{arb}, Ref{qqbar}, Int), z, a, prec)
@@ -1310,7 +1310,7 @@ Convert `a` to a complex ball with the precision of the parent field `R`.
 Throws if `a` is not a real number.
 """
 function (R::AcbField)(a::qqbar)
-   prec = precision(Balls)
+   prec = precision(R)
    z = R()
    ccall((:qqbar_get_acb, libcalcium),
         Nothing, (Ref{acb}, Ref{qqbar}, Int), z, a, prec)