# I'm doing advent of code and I'm getting  an error that doesn't make sense. If
# you are still solving part 2 and don't want a hint dont look
# ||```
# import tables

# var ctr = "KKJJT".toCountTable

# if 'J' in ctr and ctr['J'] != 5:
#   var t = ctr['J']
#   ctr.del('J')
#   ctr[ctr.largest[0]] += t
Error:
# /usercode/in.nim(8, 23) Error: type mismatch
# Expression: ctr[largest(ctr)[0]] += t
#   [1] ctr[largest(ctr)[0]]: int
#   [2] t: int

# Expected one of (first mismatch at [position]):
# [1] proc `+=`[T: SomeInteger](x: var T; y: T)
# [1] proc `+=`[T: float | float32 | float64](x: var T; y: T)
what am I misunderstanding?