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{{alias}}( [dtype1, dtype2] )
Returns the array data type with the smallest size and closest "kind" to
which array data types can be safely cast.
If not provided data types, the function returns a type promotion table.
If a data type to which data types can be safely cast does *not* exist (or
is not supported), the function returns `-1`.
If provided an unrecognized data type, the function returns `null`.
Parameters
----------
dtype1: string (optional)
Array data type.
dtype2: string (optional)
Array data type.
Returns
-------
out: Object|string|integer|null
Promotion rule(s).
Examples
--------
> var out = {{alias}}( 'float32', 'int32' )
'float64'
See Also
--------
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