What's behind ${collection?size} ?

Hi, 

In my template there is an instruction like: ${collection?size}

I noticed that when processing this instruction, Freemarker does a 'strange'
procedure to achieve the collection size. Instead of calling
collection.size() once, it repeats a call to the following instructions, for
every element in the collection:

collection.size()
collection.size()
collection.size()
collection.get(elementIndex)
collection.size()
collection.size()
collection.size()

My collection contains 100.000 elements, so the code here above is repeated
100.000 times, that is 700.000 instruction calls to get the collection
size... :S

I can easily bypass this by providing the template processor with the
explicit collection size, but I am very curious why Freemarker doesn't just
call collection.size() once. 

Cheers, 
Kjeld


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