Inconsistent values due to number format differences

[ldodds]

This generates an inconsistent values warning:

https://raw.github.com/datasets/cpi-gb/master/data/cpi-uk-annual.csv

Its because some numbers include decimal points and some dont. The former get matched as alphanumeric (because of the full stop) the latter as numeric.

[ldodds]

@pezholio any thoughts on this one?

I'm wondering whether to drop the inconsistency checks completely -- schema validation should give us some coverage of this type of issue (e.g. mixing strings/numbers).

The alternative is to improve the checking but make it more robust for some legal variations.

[JeniT]

Numbers will decimal points in them should be recognised as numeric!

[ldodds]

One option for improving this is to use some of the type validation code we have now, e.g:

Try parsing the data using various formats, keep a track of which ones pass, then warn if there are outliers.

[Floppy]

For theodi/shared#158