datavaluetype(T)

For a type T, return the corresponding DataValue type, translating between Union{T, Missing} and DataValue{T}.

For example, datavaluetype(Int64) returns Int64, while datavaluetype(Union{Int64, Missing}) returns DataValue{Int64}.

This generic function is owned by DataValueInterfaces.jl itself, which is the sole provider of the default definition.

nondatavaluetype(T)

For a type T, return the corresponding non-DataValue type, translating between Union{T, Missing} and DataValue{T}.

For example, nondatavaluetype(Int64) returns Int64, while nondatavaluetype(DataValue{Int64}) returns Union{Int64, Missing}.

This generic function is owned by DataValueInterfaces.jl itself, which is the sole provider of the default definition.