Evaluate ways to save users' gas and avoid contract reverts.

[tsuberim]

Evaluate and implement ways to save users' gas and avoid contract reverts.

We can avoid reverts by augmenting the existing function parameter validations.

As a fail-safe we could use [contract].[method].call(..), testing that it does not revert, but parameter validation should be as thorough as possible as it is most performant and would help the user in providing them useful feedback.

[contract].[method].call(..) can also be useful for avoiding no-ops that don't revert but nevertheless waste gas (see #215 for example).

Before using [contract].[method].call(..) we should investigate whether there is a significant performance hit, and if there is, we can make it be an optional feature.