Checking argument for correctness

[bartekch]

Should arguments be checked inside R in addition to checking in API? For example format of dates?

Pros:

• API not always return error, when in fact query doesn't make sense or is ambiguous (for example API silently adds zeros in front of a year - "11-11-11" is treated as "0011-11-11" not "2011-11-11")
• easier handling of error messages inside R
• sometimes it is possible to guess what user wants despite some typos

Cons:

• complete checking process has to be written
• overriding API's behaviour may not be desired

[bartekch]

Personally would go for double-checking

[mbojan]

In principle such double-checks are desirable, but I'd put it in the end of a TODO because the API is not stable enough at this moment.

[bartekch]

Almost completed in 965c6d9 , 333c4d1 , 2210dc4 , and others.
However issue is left open until stable API version.