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Contains the logic for encoding every logical protocol field type
into one of the 5 physical wire types.

This code is designed to push the Python interpreter's performance to the
limits.

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FieldDescriptor) we construct two functions:  a "sizer" and an "encoder".  The
sizer takes a value of this field's type and computes its byte size.  The
encoder takes a writer function and a value.  It encodes the value into byte
strings and invokes the writer function to write those strings.  Typically the
writer function is the write() method of a BytesIO.

We try to do as much work as possible when constructing the writer and the
sizer rather than when calling them.  In particular:
* We copy any needed global functions to local variables, so that we do not need
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* Similarly, we try to do any attribute lookups at startup time if possible.
* Every field's tag is encoded to bytes at startup, since it can't change at
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* Whatever component of the field size we can compute at startup, we do.
* We *avoid* sharing code if doing so would make the code slower and not sharing
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  manually inline the single-value encoder into the loop.
* If a Python function lacks a return statement, Python actually generates
  instructions to pop the result of the last statement off the stack, push
  None onto the stack, and then return that.  If we really don't care what
  value is returned, then we can save two instructions by returning the
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