Index utilities

apply_to_index(func)	Apply a single-index function to each level of a MultiIndex.
assign_block(index, block)	Assign or overwrite a 'block' level in the index.
outer_align_levels(dfs[, axis, fill_value])	Align MultiIndexes by performing an OUTER JOIN on level names.
overlaps(target_idx, available_idx)	Check if target index overlaps with available index.
resolve_axes(axis)	Standardize axis input into a tuple of integer axes.
round_index(index, decimals)	Round float indices to specified decimals.
to_numeric(index)	Attempt to convert index to numeric types.