Lemmatizer lowercase words in some languages / some POS tags?

[AngledLuffa]

For example, Tes amis in French could be treated as tes and therefore be lemmatized as ton

[AngledLuffa]

There is a --caseless flag, but that would apply to all tags. It would likely be an improvement to build up over time a collection of language/tag pairs which can be caseless, such as for example French/PRON and English/PRON