Water 5-Type and Object System-Object System
method is_part
Contract
Return typewob
Parameter keyDefault valueType
inopt
lookupfalseboolean
Water Contract
<method is_part
  in    =opt
  lookup=false/>
Returns true if the subject is a part of its container or a part of in_container if given.
integer.<is_part/>true
<thing/>.<make_part "foo" thing/>.<is_part/>
true
<thing/>.<is_part/>false

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