You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: finufft_opts.m
    path of file: ./repos/Swan/gypsilabModified/openFfm
    
    the code of the file until where you have to start completion: function opts = finufft_opts(o)

    
function opts = finufft_opts(o)
% FINUFFTS_OPTS.  Global set opts for matlab interface to FINUFFT, with defaults
% Barnett. Added upsampfac 6/18/18.
% Added many_seq 6/23/18, then removed 7/28/18. chkbnds=1 default 7/30/18.

% sets defaults, used if field absent or empty, and handles fields in o...
debug=0; if isfield(o,'debug') && ~isempty(o.debug), debug = o.debug; end