According to:
http://groovy.codehaus.org/groovy-jdk/java/util/Map.html#putAt%28K,%20V%29

the putAt method of Map  "Returns:  the value corresponding to the given key"
(The putAt method supposedly supports the left-hand-side assignment with subscript operator)

However, in this code:

def mymap= [one:1]
assert (mymap['one']= '111' == '111')           // OK!
assert (mymap.putAt('one', '111') == '111')     // WRONG!
assert (mymap.putAt('one', '111') == null)      // putAt actually returs null!


This has been tested with Groovy 1.7.0 and 1.5.6 (the two version I have), so I guess it happens in all versions in between and has been happening for a long time.  Nobody cared?  Is it a bug in Groovy or a documentation error, or maybe I'm not interpreting things as I should?

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