Delegate to dask directly

Author: betatim

src/array_api_extra/_delegation.py

@@ -325,6 +325,9 @@ def quantile(
 
     xp = array_namespace(x, q) if xp is None else xp
 
+    if is_dask_namespace(xp):
+        return xp.quantile(x, q, axis=axis, keepdims=keepdims, method=method)
+
     try:
         import scipy  # type: ignore[import-untyped]
         from packaging import version

src/array_api_extra/_lib/_quantile.py

@@ -37,8 +37,7 @@ def quantile(
 
     # Promote to common dtype
     x = xp.astype(x, xp.float64)
-    q_arr = xp.astype(q_arr, xp.float64)
-    q_arr = xp.asarray(q_arr, device=_compat.device(x))
+    q_arr = xp.asarray(q_arr, xp.float64, device=_compat.device(x))
 
     dtype = x.dtype
     axis_none = axis is None