Change objectID from 16 to 20 bytes (MystenLabs#5334)

doc/src/build/sui-json.md

@@ -35,7 +35,7 @@ Additionally, Move supports U128 but JSON doesn't. As a result we allow encoding
 | U64                  | Similarly to U8, three formats are supported<ul><li>Unsigned number &lt; U64::MAX.</li><li>Decimal string with value &lt; U64::MAX.</li><li>Up to 8 byte hex string prefixed with `0x`.</li></ul>                                                                                                                                 | Extrapolate above examples                                                               | Extrapolate above examples                                                                                                                                                                                                                            |
 | U128                 | Two formats are supported<ul><li>Decimal string with value &lt; U128::MAX.</li><li>Up to 16 byte hex string prefixed with `0x`.</li></ul>                                                                                                                                                                                         | `"74794734937420002470"`<br>`"0x2B1A39A1514E1D8A7CE"`                                    | `34`: Although this is a valid u128 number, it must be encoded as a string                                                                                                                                                                            |
 | Address              | 20 byte hex string prefixed with `0x`                                                                                                                                                                                                                                                                                             | `"0x2B1A39A1514E1D8A7CE45919CFEB4FEE70B4E011"`                                           | `0x2B1A39`: string too short<br>`2B1A39A1514E1D8A7CE45919CFEB4FEE70B4E011`: missing `0x` prefix<br>`0xG2B1A39A1514E1D8A7CE45919CFEB4FEE70B4E01`: invalid hex char `G`                                                                                 |
-| ObjectID             | 16 byte hex string prefixed with `0x`                                                                                                                                                                                                                                                                                             | `"0x2B1A39A1514E1D8A7CE45919CFEB4FEE"`                                                   | Similar to above                                                                                                                                                                                                                                      |
+| ObjectID             | 20 byte hex string prefixed with `0x`                                                                                                                                                                                                                                                                                             | `"0x2B1A39A1514E1D8A7CE45919CFEB4FEE"`                                                   | Similar to above                                                                                                                                                                                                                                      |
 | Identifier           | Typically used for module and function names. Encoded as one of the following:<ol><li>A String whose first character is a letter and the remaining characters are letters, digits or underscore.</li><li>A String whose first character is an underscore, and there is at least one further letter, digit or underscore</li></ol> | `"function"`,<br>`"_function"`,<br>`"some_name"`,<br>`"\___\_some_name"`,<br>`"Another"` | `"_"`: missing trailing underscore, digit or letter,<br>`"8name"`: cannot start with digit,<br>`".function"`: cannot start with period,<br>`" "`: cannot be empty space,<br>`"func name"`: cannot have spaces                                         |
 | Vector&lt;Move Type> | Homogeneous vector of aforementioned types including nested vectors of primitive types (only "flat" vectors of ObjectIDs are allowed)                                                                                                                                                                                                                                                               | `[1,2,3,4]`: simple U8 vector<br>`[[3,600],[],[0,7,4]]`: nested U64 vector `["0x2B1A39A1514E1D8A7CE45919CFEB4FEE", "0x2B1A39A1514E1D8A7CE45919CFEB4FEF"]`: ObjectID vector              | `[1,2,3,false]`: not homogeneous JSON<br>`[1,2,null,4]`: invalid elements<br>`[1,2,"7"]`: although we allow encoding numbers as strings meaning this array can evaluate to `[1,2,7]`, the array is still ambiguous so it fails the homogeneity check. |
 | Vector&lt;U8>        | <em>For convenience, we allow:</em><br>U8 vectors represented as UTF-8 (and ASCII) strings.                                                                                                                                                                                                                                       | `"√®ˆbo72 √∂†∆˚–œ∑π2ie"`: UTF-8<br>`"abcdE738-2 _=?"`: ASCII                             ||