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A query that used to not error now will result in the error. From what I can see this is correct behavior, but it should be documented/noted.
On 2.4.9:
> db.myCollection.find( {x: {$elemMatch: { $where: "this.credits == this.debits" }}} );
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>
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On 2.5.5-pre
> db.runCommand({"buildinfo": 1})
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{
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"version" : "2.5.5-pre-",
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"gitVersion" : "f65a0b814b8c77e3fbe90bca0c061c9b77f6acdb",
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"OpenSSLVersion" : "",
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"sysInfo" : "Darwin Andrew-Emil-MacBook-Pro.local 12.4.0 Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49",
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"loaderFlags" : "-fPIC -pthread -Wl,-bind_at_load -mmacosx-version-min=10.6",
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"compilerFlags" : "-Wnon-virtual-dtor -Woverloaded-virtual -fPIC -fno-strict-aliasing -ggdb -pthread -Wall -Wsign-compare -Wno-unknown-pragmas -Winvalid-pch -Werror -pipe -O3 -Wno-unused-function -Wno-deprecated-declarations -mmacosx-version-min=10.6",
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"allocator" : "tcmalloc",
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"versionArray" : [
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2,
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5,
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5,
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-100
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],
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"javascriptEngine" : "V8",
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"bits" : 64,
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"debug" : false,
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"maxBsonObjectSize" : 16777216,
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"ok" : 1
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}
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> db.myCollection.find( {x: {$elemMatch: { $where: "this.credits == this.debits" }}} );
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error: {
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"$err" : "Can't canonicalize query: BadValue unknown operator: $where",
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"code" : 17287
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}
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