Function wrap

Turn a TLV class into a field type, where the TLV directly appears as the field.

Example

Given this structure:

Outer = OUTER-TYPE TLV-LENGTH Inner
Inner = INNER-TYPE TLV-LENGTH INNER-VALUE
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You can define the Outer builder:

const buildOuter = new StructBuilder("Outer", TT.Outer)
  .add(TT.Inner, "inner", StructFieldType.wrap(Inner));
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Inner type must encode itself as a TLV, and its TLV-TYPE must equal field TLV-TYPE.