diff --git a/Project.toml b/Project.toml
index 5270dd68..48298903 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "Arblib"
 uuid = "fb37089c-8514-4489-9461-98f9c8763369"
 authors = ["Marek Kaluba <kalmar@amu.edu.pl>", "Sascha Timme <Sascha Timme <timme@math.tu-berlin.de>", "Joel Dahne <joel@dahne.eu>"]
-version = "0.7.3"
+version = "0.8.0"
 
 [deps]
 Arb_jll = "d9960996-1013-53c9-9ba4-74a4155039c3"
diff --git a/src/precision.jl b/src/precision.jl
index a54be0e0..a9451f98 100644
--- a/src/precision.jl
+++ b/src/precision.jl
@@ -17,6 +17,8 @@ Base.precision(x::ArbTypes) = x.prec
 Base.precision(x::MagLike) = DEFAULT_PRECISION[]
 # disambiguation
 Base.precision(::MagOrRef) = DEFAULT_PRECISION[]
+# ArbSeries and AcbSeries don't store their precision
+Base.precision(x::Union{ArbSeries,AcbSeries}) = precision(x.poly)
 
 @inline _precision(x::Union{ArbTypes,BigFloat}) = precision(x)
 @inline _precision(z::Complex) = max(_precision(real(z)), _precision(imag(z)))
@@ -60,7 +62,7 @@ Base.setprecision(A::T, prec::Integer) where {T<:Union{AcbMatrix,AcbRefMatrix}}
 
 Base.setprecision(poly::ArbPoly, prec::Integer) = ArbPoly(poly.arb_poly; prec)
 Base.setprecision(series::ArbSeries, prec::Integer) =
-    ArbSeries(series.arb_poly, degree = degree(series); prec)
+    ArbSeries(series, degree = degree(series); prec)
 Base.setprecision(poly::AcbPoly, prec::Integer) = AcbPoly(poly.acb_poly; prec)
 Base.setprecision(series::AcbSeries, prec::Integer) =
-    AcbSeries(series.acb_poly, degree = degree(series); prec)
+    AcbSeries(series, degree = degree(series); prec)
diff --git a/src/types.jl b/src/types.jl
index 2a0baaa1..6f48c9b2 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -91,14 +91,16 @@ end
 
 """
     ArbSeries <: Number
+
+This type should be considered experimental, the interface for it
+might change in the future.
 """
 struct ArbSeries <: Number
-    arb_poly::arb_poly_struct
+    poly::ArbPoly
     degree::Int
-    prec::Int
 
     ArbSeries(; degree::Integer = 0, prec::Integer = DEFAULT_PRECISION[]) =
-        fit_length!(new(arb_poly_struct(), degree, prec), degree + 1)
+        fit_length!(new(ArbPoly(; prec), degree), degree + 1)
 end
 
 """
@@ -113,14 +115,16 @@ end
 
 """
     AcbSeries <: Number
+
+This type should be considered experimental, the interface for it
+might change in the future.
 """
 struct AcbSeries <: Number
-    acb_poly::acb_poly_struct
+    poly::AcbPoly
     degree::Int
-    prec::Int
 
     AcbSeries(; degree::Integer = 0, prec::Integer = DEFAULT_PRECISION[]) =
-        fit_length!(new(acb_poly_struct(), degree, prec), degree + 1)
+        fit_length!(new(AcbPoly(; prec), degree), degree + 1)
 end
 
 """
@@ -235,6 +239,10 @@ for (T, prefix) in (
     end
 end
 
+# ArbSeries and AcbSeries requires a different cstruct implementation
+cstruct(x::ArbSeries) = cstruct(x.poly)
+cstruct(x::AcbSeries) = cstruct(x.poly)
+
 # handle Ref types
 for prefix in [:mag, :arf, :arb, :acb]
     T = Symbol(uppercasefirst(string(prefix)))