 Can someone explain why this happens when one of the list elements is named 'all'?

> zz <- list( zoo(1:10,1:10), zoo(101:110,1:10), zoo(201:210,1:10) )
> names(zz)<-c('test','bar','foo')
> do.call(cbind,zz)
   test bar foo
1     1 101 201
2     2 102 202
3     3 103 203
4     4 104 204
5     5 105 205
6     6 106 206
7     7 107 207
8     8 108 208
9     9 109 209
10   10 110 210
> names(zz)<-c('test','all','foo')
> do.call(cbind,zz)
   test foo
1     1 201
2     2 202
3     3 203
4     4 204
5     5 205
6     6 206
7     7 207
8     8 208
9     9 209
10   10 210
> 
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