cast_value README example writes "+Infinity", which the Zarr V3 fill value encoding spells "Infinity" #76

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The NumPy-compatibility example in the cast_value README maps "+Infinity" (L133-L135):

"encode": [
    ["NaN", 0],
    ["+Infinity", 0],
    ["-Infinity", 0]
]

The same README says each scalar_map scalar "is encoded to JSON using the Zarr V3 fill value encoding" for its data type (L107). That encoding spells positive infinity "Infinity", next to "-Infinity" and "NaN" (data types, L68-L74). A reader that follows the normative text refuses the example; zarr-python accepts it.

Suggested fix: write "Infinity" in the example.