Unset number property #176
Description
Similar to #71, it doesn't appear possible to unset a number property as it expects a float64, which cannot be nil. Using an empty NumberProperty sets the value to 0, rather than unsettling it.
Please could it be possible to unset a number property?
N.B. I'm very new to programming in Go, so apologies if there's something I'm missing. I'm learning go with this package in a personal project and it's been very helpful, so thank you 😄