File separator characters in Variable names causes shift in dataset metadata write

[BrianMichell]

import xarray as xr
import numpy as np

# Create coordinate arrays
x = np.arange(0, 10, 1)  # 10 points along X
y = np.arange(0, 5, 1)   # 5 points along Y

# Create some example 2D data (here we'll use a simple grid pattern)
data = np.random.rand(len(y), len(x))  # 5x10 grid of random values

# Create the dataset
ds = xr.Dataset(
    data_vars={
        'DATA': (['Y', 'X/var'], data)  # Define data with dimensions
    },
    coords={
        'X/var': x,
        'Y': y
    }
)

# Print the dataset to see its structure
print(ds)

ds.to_zarr("test.zarr")

Sample program of the behavior MDIO should follow.

Updating hello_mdio with variable X updated to have the name X/var generates the .zmetadata file under dir X.