Repeat iterates second sequence more than once

Cartesian iterates second sequence as many times as items in the first sequence. There's even a to-do comment in the code that this needed addressing:

MoreLINQ/MoreLinq/Repeat.cs

Lines 56 to 61 in f6a3f7b

    
           while (count == null || count-- > 0) 
        
           { 
        
               // TODO buffer to avoid multiple enumerations 
        
               foreach (var item in sequence) 
        
                   yield return item; 
        
           }

This is being considered a breaking change for sake of alerting users that it's behaving now the way it should've in the first place.

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	while (count == null \|\| count-- > 0)
	{
	// TODO buffer to avoid multiple enumerations
	foreach (var item in sequence)
	yield return item;
	}

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