def deprecation_handler(kwargs):
    """
    As things change from version to version, deal with them here.
    """
    if 0:
        if 'infer_gene_extent' in kwargs:
            raise ValueError(
                "'infer_gene_extent' is deprecated as of version 0.8.4 in favor of more granular control over inferring genes and/or transcripts.  The previous default was 'infer_gene_extent=True`, which corresponds to the new defaults 'disable_infer_genes=False' and 'disable_infer_transcripts=False'. Please see the docstring for gffutils.create_db for details."
                )
    if len(kwargs) > 0:
        raise TypeError('unhandled kwarg in %s' % kwargs)
