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Why is this an issue?
Numbers can be shifted with the << and >> operators,
but the right operand of the operation needs to be an int or a type that has an implicit
conversion to int. However, when the left operand is dynamic, the compiler’s type checking is turned
off, so you can pass anything to the right of a shift operator and have it compile. And if the argument can’t be implicitly converted to
int at runtime, then a RuntimeBinderException will be
raised.
dynamic d = 5;
var x = d >> 5.4;   // Noncompliant
x = d << null;      // Noncompliant
x <<= new object(); // Noncompliant

Resources
Documentation

  
 Shift
  Operators 
  
 Implicit
  Conversions 
  
 RuntimeBinderException Class
  
  
 Using type dynamic