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Looking at latest revsion of ExtensionFunctions.php, the word "constructor" in the first switch 
statement is incorrect.

It reads (lines trimmed of excess whitespace to fit neatly)

    default: 
             wfDebugDieBacktrace( "Too many arguments to construtor in extCreateObject" );

But should read

    default:
             wfDebugDieBacktrace( "Too many arguments to constructor in extCreateObject" );

A small, easily fixable typo.