fGarch and is.na()

Hello,

after loading package "fGarch" the function is.na.data.frame() is behaving different:

sessionInfo()

R version 2.8.0 (2008-10-20) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

dfr  <- data.frame(matrix(0,nrow = 1 , ncol = 1000))
dfr2 <- is.na(dfr)

require(fGarch)

Loading required package: fGarch
Loading required package: timeDate
Loading required package: timeSeries
Loading required package: fBasics
Loading required package: MASS

dfr2 <- is.na(dfr)

Error: evaluation nested too deeply: infinite recursion / options(expressions=)?

I wonder whether this is intended.

Best,

Felix

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