[PATCH v2] box: add support for decimals in update ops

[Konstantin Osipov]

* Serge Petrenko <sergepetrenko at tarantool.org> [19/08/21 12:03]:
> Closes #4413
> 
> @TarantoolBot document
> Title: update operations on decimal fields.
> 
> tuple:update and space:update now support deicmal operands for
> arithmetic operations ('+' and '-'). The syntax is as usual:

Please document how type arithmetics work, and cover it with
tests.

-- 
Konstantin Osipov, Moscow, Russia