A difference in behaviour between :g and :<range>normal recently frustrated me, 
and I wonder if it's up for debate:

:g does a pass on matching lines and marks them before performing the 
operation; this allows it to be generally undeterred by operations that include 
addition/deletion of lines.

:<range>normal does not do this, and as a result, it can get "thrown off" by 
such operations. For (a trivial) example, on the hypothetical file:

foo
bar
baz

Performing :1,3normal yyp would produce the following result:

foo
foo
foo
foo
bar
baz

Whereas the more intuitive result would be:

foo
foo
bar
bar
baz
baz

There does exist a workaround, in the form of :<range>g/^/normal yyp -- simply 
using :g in a way guaranteed to match every line in the desired range -- but 
this is a bit of a compositional kludge.

Would it be feasible to add the marking behaviour of :g to :normal, or is that 
not worth implementing / a feature?

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