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irb(main):024:0> puts ([].methods - DataMapper::Associations::HasManyAssociation::Set.instance_methods).to_yaml
--- 
- concat
- delete_at
- pack
- each_index
- to_csv
- replace
- at
- empty?
- delete_if
- slice!
- uniq!
- reverse_each
- compact
- fetch
- indexes
- reject!
- transpose
- indices
- compact!
- flatten
- join
- "&"
- push
- fill
- sort!
- "*"
- +
- flatten!
- insert
- "-"
- nitems
- pop
- group_by
- assoc
- collect!
- delete
- reverse
- <=>
- length
- shift
- index
- rassoc
- "|"
- map!
- size
- values_at
- unshift
- slice
- "[]"
- yaml_initialize
- rindex
- uniq
- reverse!
- "[]="
- to_ary
=> nil
irb(main):025:0>