fix type problems

src/cdiDataset/variable.jl

@@ -103,7 +103,7 @@ end
 export loadData!
 
 function loadMissingData!(data::VariableMissingDataType{N}, var::Variable)::VariableMissingDataType where {N}
-    tmp = similar(data)
+    tmp = similar(data, Float64)
     streamReadVar(var.streamID, var.varID, reshape(tmp, :))
     for i in CartesianIndices(data)
         data[i] = tmp[i] == var.missValue ? missing : tmp[i]
@@ -112,7 +112,7 @@ function loadMissingData!(data::VariableMissingDataType{N}, var::Variable)::Vari
 end
 
 function loadMissingData!(data::VariableMissingDataType{1}, var::Variable)::VariableMissingDataType
-    tmp = similar(data)
+    tmp = similar(data, Float64)
     streamReadVar(var.streamID, var.varID, tmp)
     for i in CartesianIndices(data)
         data[i] = tmp[i] == var.missValue ? missing : tmp[i]