Float32 converted Float64 during reference creation

[yuanjianz]

Kerchunk Verison: 0.2.7 I am using kerchunk to convert my netcdf files on s3 to json references. The original netcdf files are composed of variables of mixed data type of float32 and float64. After converted to json and read through xarray, all float data are converted to float64. I wonder is it an expected behaviour?