Either support passing of all Quantified-like objects to all functions supporting them or create a new TypeVar

[Zeitsperre]

• xclim version: v0.48.3-dev
• Python version: Any
• Operating System: All

Description

We currently use the Quantified type alias in almost all the threshold-based indicators to specify that this variable should conform to something resembling a string with units (str | pint.Quantity), but this alias also includes xarray.DataArray. Does this mean that we can pass (or would like to enable passing) DataArrays of grids denoting thresholds? No, we currently don't support that behaviour, but maybe we would want to?

If not, we may need to create a new, more constrained custom variable (str2pint often takes variables of this type but does not support pint.Quantity or xarray.DataArray). Solving this issue alone will resolve at least 1/4 of all errors associated with mypy typing (~300+).

See also: #1719 and #1721