pass explicit dtype to to_numpy

Author: amorison

src/stagpy/stagyydata.py

@@ -165,7 +165,7 @@ def _tseries(self) -> DataFrame:
 
     def __getitem__(self, name: str) -> dt.Tseries:
         if name in self._tseries.columns:
-            series = self._tseries[name].to_numpy()
+            series = self._tseries[name].to_numpy(dtype=np.float64)
             time = self.time
             if name in phyvars.TIME:
                 meta = phyvars.TIME[name]
@@ -214,7 +214,7 @@ def tslice(
     @property
     def time(self) -> NDArray[np.float64]:
         """Time vector."""
-        return self._tseries["t"].to_numpy()
+        return self._tseries["t"].to_numpy(dtype=np.float64)
 
     @property
     def isteps(self) -> NDArray[np.float64]:

src/stagpy/step.py

@@ -486,7 +486,7 @@ def _rprofs(self) -> DataFrame:
     def __getitem__(self, name: str) -> Rprof:
         step = self.step
         if name in self._rprofs.columns:
-            rprof = self._rprofs[name].to_numpy()
+            rprof = self._rprofs[name].to_numpy(dtype=np.float64)
             rad = self.centers
             if name in phyvars.RPROF:
                 meta = phyvars.RPROF[name]