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Each major release will have one recommended data format which will be the
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default. The name of the format will indicate which release series (not
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specific release) it comes from: '2a' is the first supported format for
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During a development series we may have a series of experimental formats.
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We will not leave people stranded if they test these formats, but we also
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won't guarantee to keep supporting them in a future release. If something
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inserted in one development release turns out to be bad it can just be