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Compact encoding of expressions
===============================
First byte:
7 bits: token type
1 bit: long encoding
Second byte:
6 bits: column advancement (if line adv != 0, then from start of line)
2 bits: line advancement
Third-fourth byte:
16 bits: string table ID
(different namespaces for:
types/methods/fields/locals/constructors/typeidents/strings)
- The IDs could be sorted such that the most common ones have low
(16 bit) IDs.
- This is a string, not a bound symbol, so the same ID might be used
for different symbols/variables in different contexts!
- With a 32-bit ID, it would be possible to have an offset into a string
tables. BUT constructing such a string table (with immutable offsets)
might be inefficient.
Long encoding
-------------
7 bits: token type
1 bit: long encoding (= 1)
8 bits: column number (0 = too long)
16 bits: line number (0 = too long)
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