Merge pull request #22385 from seberg/deprecate-out-of-bound-pyint-conversion

DEP: Deprecate conversion of out-of-bound Python integers

1 files changed, 7 insertions, 1 deletions

diff --git a/numpy/ma/core.py b/numpy/ma/core.py
index 902a25b67..ba01f3e2e 100644
--- a/numpy/ma/core.py
+++ b/numpy/ma/core.py
@@ -201,7 +201,13 @@ def _recursive_fill_value(dtype, f):
     Recursively produce a fill value for `dtype`, calling f on scalar dtypes
     """
     if dtype.names is not None:
-        vals = tuple(_recursive_fill_value(dtype[name], f) for name in dtype.names)
+        # We wrap into `array` here, which ensures we use NumPy cast rules
+        # for integer casts, this allows the use of 99999 as a fill value
+        # for int8.
+        # TODO: This is probably a mess, but should best preserve behavior?
+        vals = tuple(
+                np.array(_recursive_fill_value(dtype[name], f))
+                for name in dtype.names)
         return np.array(vals, dtype=dtype)[()]  # decay to void scalar from 0d
     elif dtype.subdtype:
         subtype, shape = dtype.subdtype