# Pastebin EOJK5jTo
MacBook-Pro-de-Fernando:update fernando$ for f in v1/META6.json v1/A.pm6 v2/META6.json v2/A.pm6 test.t ; do echo -e "\n# $f"; cat $f; echo "# --------------------"; done

# v1/META6.json
{
    "perl" : "6.*",
    "name" : "test",
    "version" : "1",
    "provides" : {
        "A": "A.pm6"
    },
    "source-url" : "git@github.com:FCO/DateTime-Extended.git"
}
# --------------------

# v1/A.pm6
class A:ver<1> {
	has $.v1api = "OK"
}
# --------------------

# v2/META6.json
{
    "perl" : "6.*",
    "name" : "test",
    "version" : "2",
    "provides" : {
        "A": "A.pm6"
    },
    "source-url" : "git@github.com:FCO/DateTime-Extended.git"
}
# --------------------

# v2/A.pm6
class A:ver<2> {
	has $.v2api = "OK"
}
# --------------------

# test.t
use lib ".";
use A;

say A.new.v1api
# --------------------
MacBook-Pro-de-Fernando:update fernando$ perl6 -Iv1 test.t 
OK
MacBook-Pro-de-Fernando:update fernando$ perl6 -Iv2 test.t 
OK