Suppressing name-wrangling in a data.frame

Is there a simple way to avoid name-wrangling in a dataframe?

Math operations on a dataframe cause R to correct the names(), for instance from "1" "2" "3" to "X1" "X2" "X3"

A workaround is to as.matrix() the dataframe, perform the math, then re-data.frame() it, but this seems like the long way home 

Thanks 
Steve Wisdom

df <- data.frame(matrix(1:15,5),check.names=F)

df

1  2  3
1 1  6 11
2 2  7 12
3 3  8 13
4 4  9 14
5 5 10 15

df+0

X1 X2 X3
1  1  6 11
2  2  7 12
3  3  8 13
4  4  9 14
5  5 10 15

data.frame(as.matrix(df)+0,check.names=F)

1  2  3
1 1  6 11
2 2  7 12
3 3  8 13
4 4  9 14
5 5 10 15

names(df)

[1] "1" "2" "3"

names(df+0)

[1] "X1" "X2" "X3"

version

_              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    1              
minor    6.1            
year     2002           
month    11             
day      01             
language R

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