Fix value prop usage in NumericFormat

[oliviera9]

The usage of + sign returns the numerical representation of an object.
With some strings, this introduces some unwanted rounding.

For example:

const val = "2812.4283046805994"
console.info(+val)
# 2812.4283046805995

Plus, NumericFormat expects value to be of type string, so it's not necessary to cast into number.

This PR just revises how value is passed to NumericFormat.

[envin3]

LGTM!