addresses hgrecco#1845

pint/util.py

@@ -502,7 +502,7 @@ def add(self: Self, key: str, value: Number) -> Self:
  UnitsContainer
  A copy of this container.
  """
- newval = self._d[key] + value
+ newval = self._d[key] + self._normalize_nonfloat_value(value)
  new = self.copy()
  if newval:
  new._d[key] = newval
@@ -654,7 +654,7 @@ def __truediv__(self, other: Any):
 
  new = self.copy()
  for key, value in other.items():
- new._d[key] -= value
+ new._d[key] -= self._normalize_nonfloat_value(value)
  if new._d[key] == 0:
  del new._d[key]
 
@@ -668,6 +668,11 @@ def __rtruediv__(self, other: Any):
 
  return self**-1
 
+ def _normalize_nonfloat_value(self, value: Scalar) -> Scalar:
+ if not isinstance(value, int) and not isinstance(value, self._non_int_type):
+ return self._non_int_type(value) # type: ignore[no-any-return]
+ return value
+
 
 class ParserHelper(UnitsContainer):
  """The ParserHelper stores in place the product of variables and