API:move use of maybe_convert_numeric_to_64bit to IntervalArray._simp…

…le_new

pandas/core/arrays/interval.py

@@ -269,7 +269,6 @@ def __new__(
 
             # might need to convert empty or purely na data
             data = _maybe_convert_platform_interval(data)
-            data = maybe_convert_numeric_to_64bit(data)
             left, right, infer_closed = intervals_to_interval_bounds(
                 data, validate_closed=closed is None
             )
@@ -307,7 +306,10 @@ def _simple_new(
         from pandas.core.indexes.base import ensure_index
 
         left = ensure_index(left, copy=copy)
+        left = maybe_convert_numeric_to_64bit(left)
+
         right = ensure_index(right, copy=copy)
+        right = maybe_convert_numeric_to_64bit(right)
 
         if dtype is not None:
             # GH 19262: dtype must be an IntervalDtype to override inferred