Update xarray_schema/core.py

Co-authored-by: Joe Hamman <[email protected]>

Author: orianac

xarray_schema/core.py

@@ -109,7 +109,7 @@ def validate(self, da: xr.DataArray) -> xr.DataArray:
             for key, ec in self.chunks.items():
                 if isinstance(ec, int):
                     # handles case of expected chunksize is shorthand of -1 which translates to the full length of dimension
-                    if ec==-1:
+                    if ec < 0:
                         ec = len(da[key])
                         # grab the first entry in da's tuple of chunks to be representative (as it should be assuming they're regular)
                     ac = dim_chunks[key][0]