R-alpha: Array indexing out of range -- difference to R-minus

[Martin Maechler]

> x <- cbind(1,1:3); x
     [,1] [,2]
[1,]    1    1
[2,]    1    2
[3,]    1    3
> x[5:6] <- 10
> x
     [,1] [,2]
[1,]    1    1
[2,]    1   10
[3,]    1   10
> x[5:7] <- 12 #<<<<< loses its dimension, because of `out of range' indexing
> x
[1]  1  1  1  1 12 12 12

     1  2  3  4  5  6  7

---
with S-plus or S4,
	x remains a 3 x 2  matrix;
	it only `silently' grows  *after* being coerced to vector 
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