BUG: Fix file-like object check when saving arrays #14082
Merged
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Backport of #14063 .
For writing arrays, only the write method is necessary.
I had code that was broken by this check and had to introduce a fake read method for it to work: https://github.com/luispedro/jug/blob/b32f4389acd1c3edf1a6a593799e853ded7849a2/jug/backends/encode.py#L88