Add length field to Bytes and String layout

Annotate Bytes and String variants of the binary_description type layout with Encoding.Kind.length parameters in order to preserve fixed-length information when used as internal layout of a Seq encoding (List or Array).

[Fix for bug noted in issue #26 ]

[Rebased onto test case addition !48 (closed) ]

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• 34aab402...f67cb75c - 14 commits from branch nomadic-labs:master
• ab29d5be - Add length field to Bytes and String layout

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• 6e55db77 - Add length field to Bytes and String layout

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I think that further changes are needed in order to carry the information all the way to the printing part. I'm guessing the pretty-printer for the layout needs to mention the size of the strings/bytes. I'm not sure if it needs anything else.

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• c035eee0 - Add length field to Bytes and String layout

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resolved all threads

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mentioned in merge request !48 (closed)

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• 9de7e151 - Test: add test for fixed-length sequence elem bug
• 4be1a910 - Update test/fixed_seq.ml
• 326c9f5e - Update test/fixed_seq.ml
• c57a136c - Add length field to Bytes and String layout

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added 4 commits

• a0ec34b2 - Apply 1 suggestion(s) to 1 file(s)
• b7618bde - Extend fixed_seq test cases
• 891a8cbd - Autoformat for CI
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changed the description

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• c705c290 - Add length field to Bytes and String layout

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ping @yrg

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added 3 commits

• c30aecc3 - Test: add test for fixed-length sequence elem bug
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• 81c52364 - ocamlformat: auto-promote

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• 81c52364...ab152bb7 - 3 commits from branch nomadic-labs:master
• 5c705b61 - Test: add test for fixed-length sequence elem bug
• c486ee4e - Add length field to Bytes and String layout
• e6f923d7 - ocamlformat: auto-promote

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added 9 commits

• e6f923d7...1c073b8b - 6 commits from branch nomadic-labs:master
• adb898fd - Test: add test for fixed-length sequence elem bug
• 10288c7a - Add length field to Bytes and String layout
• fc3706e8 - ocamlformat: auto-promote

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requested review from @yrg