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Code Analyzer based on Omnisharp

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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

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Documentation

   Shift
  Operators 
   Implicit
  Conversions 
   RuntimeBinderException Class
  
   Using type dynamic