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Bolt 1: Clarify the definition of tu fields (#1073)

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Truncated integer fields, e.g. tu16 cannot have leading zeros
judging by the implementations of the parsers, which are used
across the different ln implementations.
The `can` imposed that it is not necessary to truncate the fields
to values of information.

Signed-off-by: Peter Neuroth <pet.v.ne@gmail.com>
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Peter Neuroth 2023-05-08 22:57:46 +02:00 • committed by GitHub
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01-messaging.md
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@ -224,12 +224,12 @@ Various fundamental types are referred to in the message specifications:
* `u32`: a 4 byte unsigned integer
* `u64`: an 8 byte unsigned integer
Inside TLV records which contain a single value, leading zeros in
integers can be omitted:
For the final value in TLV records, truncated integers may be used. Leading zeros in
truncated integers MUST be omitted:
* `tu16`: a 0 to 2 byte unsigned integer
* `tu32`: a 0 to 4 byte unsigned integer
* `tu64`: a 0 to 8 byte unsigned integer
* `tu16`: a 0 to 2 byte truncated unsigned integer
* `tu32`: a 0 to 4 byte truncated unsigned integer
* `tu64`: a 0 to 8 byte truncated unsigned integer
When used to encode amounts, the previous fields MUST comply with the upper
bound of 21 million BTC: