I wonder whether there's a semantic or pragmatic difference between "It is I/me" and "That is I/me"
To me, the contracted form "It's I" sounds completely wrong, whereas "It's me" is fine. Whereas in the 'full' form, "It is I" sounds OK, if a bit prissy, and "It is me" sounds a bit odd.
On the other hand, "That is I" sounds incorrect while "That is me" sounds fine.
All very messy.
#Linguistics @languagelovers group 

 @2184a19c I don't think there would be "one" semantic/pragmatic factor here. There's also the question of the many Englishes, and the many contexts it's used in (/style/register). But I don't think it's controversial to call the use of "I" here archaic-sounding.