Implement operator + on period, duration
Currently:
> as.period("1d") + as.duration(1)
Error: 1.1-32: invalid type for binary operator (period + duration)
1: as.period("1d") + as.duration(1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^`
Currently:
> as.period("1d") + as.duration(1)
Error: 1.1-32: invalid type for binary operator (period + duration)
1: as.period("1d") + as.duration(1)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^`