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I cut bias binding and bound it. I am not a big fan of raw edge necklines.
What kind of fabric are you using? I think the fabric dictates what you can do. Aside from binding, you could roll the edge or do some decorative stitching (scallop and trim to stitching edge), serge or faux serge and use a slip or blanket stitch for a scant turned edge, even very thin piping.