diff --git a/Project.toml b/Project.toml
index a8f07fed..5f71ff03 100644
--- a/Project.toml
+++ b/Project.toml
@@ -25,7 +25,8 @@ julia = "1"
 
 [extras]
 Aqua = "4c88cf16-eb10-579e-8560-4a9242c79595"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["Aqua", "Test"]
+test = ["Aqua", "Random", "Test"]
diff --git a/src/concrete/import.jl b/src/concrete/import.jl
index 0d86f387..8d4af26e 100644
--- a/src/concrete/import.jl
+++ b/src/concrete/import.jl
@@ -13,3 +13,11 @@ pyimport((m,k)::Pair) = (m_=pyimport(m); k_=pygetattr(m_,k); pydel!(m_); k_)
 pyimport((m,ks)::Pair{<:Any,<:Tuple}) = (m_=pyimport(m); ks_=map(k->pygetattr(m_,k), ks); pydel!(m_); ks_)
 pyimport(m1, m2, ms...) = map(pyimport, (m1, m2, ms...))
 export pyimport
+
+"""
+    pymoduleexists(m)
+
+Check if module `m` can be found, without actually importing it.
+"""
+pymoduleexists(m::AbstractString) = pyconvert(Bool, pyimport("importlib.util").find_spec(m) != Py(nothing))
+export pymoduleexists
diff --git a/src/jlwrap/array.jl b/src/jlwrap/array.jl
index bbbe6d67..cd693b6e 100644
--- a/src/jlwrap/array.jl
+++ b/src/jlwrap/array.jl
@@ -314,7 +314,7 @@ function init_jlwrap_array()
         @property
         def __array_interface__(self):
             return self._jl_callmethod($(pyjl_methodnum(pyjlarray_array_interface)))
-        def __array__(self):
+        def __array__(self, dtype=None):
             # convert to an array-like object
             arr = self
             if not (hasattr(arr, "__array_interface__") or hasattr(arr, "__array_struct__")):
@@ -326,7 +326,7 @@ function init_jlwrap_array()
             # convert to a numpy array if numpy is available
             try:
                 import numpy
-                arr = numpy.array(arr)
+                arr = numpy.array(arr, dtype=dtype)
             except ImportError:
                 pass
             return arr
diff --git a/test/concrete.jl b/test/concrete.jl
index a7b68fb5..a4a53f97 100644
--- a/test/concrete.jl
+++ b/test/concrete.jl
@@ -1,4 +1,7 @@
 @testset "import" begin
+    @test pymoduleexists("sys")
+    @test pymoduleexists("os")
+    @test !pymoduleexists(randstring(32))
     sys = pyimport("sys")
     os = pyimport("os")
     @test pyeq(Bool, sys.__name__, "sys")
diff --git a/test/jlwrap.jl b/test/jlwrap.jl
index c4dd3dc7..89ebe348 100644
--- a/test/jlwrap.jl
+++ b/test/jlwrap.jl
@@ -5,3 +5,19 @@
     x4 = pyconvert(Vector{Int}, x3)
     @test x1 == x4
 end
+
+@testset "dtypes" begin
+    if !pymoduleexists("numpy")
+        PythonCall.C.CondaPkg.add("numpy")
+    end
+    np = pyimport("numpy");
+    y = range(-5,5,length=11)
+    arr = np.asarray(y)
+    @test pyconvert(Int, arr.size) == 11
+    @test pyconvert(String, arr.dtype.name) == "float64"
+    @test all(iszero.(pyconvert(Any, arr) .- y))
+    arr32 = np.asarray(y, dtype=np.float32)
+    @test pyconvert(Int, arr32.size) == 11
+    @test pyconvert(String, arr32.dtype.name) == "float32"
+    @test all(iszero.(pyconvert(Any, arr32) .- y))
+end
diff --git a/test/runtests.jl b/test/runtests.jl
index 8054e997..d0ef4092 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,4 +1,4 @@
-using PythonCall, Test, Dates, Aqua
+using PythonCall, Test, Dates, Random, Aqua
 
 # The unbound_args test fails on methods with signature like foo(::Type{Tuple{Vararg{V}}}) where V
 # Seems like a bug.