code: public final IonTextWriterBuilder
      withIvmMinimizing(IvmMinimizing minimizing)
      {
          IonTextWriterBuilder b = mutable();
          b.setIvmMinimizing(minimizing);
          return b;
      }
docs: Declares the strategy for reducing or eliminating non-initial Ion version
  markers, returning a new mutable builder if this is immutable.
  When null, IVMs are emitted as they are written.
  
  @param minimizing the IVM minimization strategy.
  Null indicates that all explicitly-written IVMs will be emitted.
  
  @return this instance, if mutable;
  otherwise a mutable copy of this instance.
  
  @see #setIvmMinimizing(IonWriterBuilder.IvmMinimizing)
  @see #getIvmMinimizing()