Apply ruff preview rule RUF046 (pydata#10199)

RUF046 Value being cast to `int` is already an integer

Author: DimitriPapadopoulos

pyproject.toml

@@ -276,11 +276,10 @@ ignore = [
   "RUF001",  # string contains ambiguous unicode character
   "RUF002",  # docstring contains ambiguous acute accent unicode character
   "RUF003",  # comment contains ambiguous no-break space unicode character
-  "RUF005",  # consider upacking operator instead of concatenation
+  "RUF005",  # consider unpacking operator instead of concatenation
   "RUF012",  # mutable class attributes
 ]
 
-
 [tool.ruff.lint.per-file-ignores]
 # don't enforce absolute imports
 "asv_bench/**" = ["TID252"]

xarray/core/resample_cftime.py

@@ -475,7 +475,7 @@ def exact_cftime_datetime_difference(a: CFTimeDatetime, b: CFTimeDatetime):
     datetime.timedelta
     """
     seconds = b.replace(microsecond=0) - a.replace(microsecond=0)
-    seconds = int(round(seconds.total_seconds()))
+    seconds = round(seconds.total_seconds())
     microseconds = b.microsecond - a.microsecond
     return datetime.timedelta(seconds=seconds, microseconds=microseconds)