Pitches can be represented as a vector of integers, or a comma-separated string as integers:
60:64 %>% trans(1)
60:64 %>% trans(-1)
"60,61,62" %>% trans(1)
# To pitch class:
60:65 %>% pc()
"60,61,62" %>% pc()
# 60:65 %>% int()
# "60,61,62" %>% int()
# 60:65 %>% int() %>% fuzzy()
# 60:65 %>% int() %>% parsons()