grid parsing empty string as zero for number cell

I’m loading a grid with some data. One of the cell/columns in the grid is set to “edn” type (i.e. number). When I supply a value of “” to the parse function (with jsarray type) the edn cell gets loaded with “0”. Is there a way to set the cell/column so that “” or null doesn’t get parsed as “0” (and instead is parsed as “”)?

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