how to set missing data value to 0

[yaya3939]

Hello, my data doesn't include all date and value for everyday in the month. Missing data value is null, now. Because of it, My scale doesn't work like the way I hope.
I set opacity , [0,5] domain in scale. I want all missing data subdomain's opacity to be 0.
But because missing data value is null, where I hope opacity 0 opacity is 1 now, just like value === 5.
I've tried using func(some conditional syntax) in x/y of data, but I found that it doesn't deal with missing data, it's about data already existed.
And considerMissingDataAsZero seems not active now.
Is there anyway to set missing data value 0?

[wa0x6e]

Will be added in next 4.2.0 release