Function Struct

Struct(fields: ReadonlyMap<number, RelishValue>): RelishStruct
Creates a struct Relish value.

A struct is a heterogeneous collection of named fields, each with a numeric field ID (0-127) and a RelishValue. Fields are encoded in ascending ID order.
Parameters
- fields: ReadonlyMap<number, RelishValue>
  Map of field ID to RelishValue for each field
Returns RelishStruct
RelishStruct value
Example
```
import { Struct, String_, U32, encode } from '@grounds/core';

const person = Struct(new Map([
  [0, String_('Alice')],  // field 0: name
  [1, U32(30)]            // field 1: age
]));
encode(person).match(
  (bytes) => console.log('Struct encoded:', bytes),
  (error) => console.error(error)
);
```
Remarks
Fields must be in ascending ID order during encoding. The Encoder enforces this constraint and returns an error if violations occur. Field IDs must be in range 0-127 (bit 7 must be clear).
See
- Array_ for homogeneous ordered collections
- Map_ for homogeneous key-value collections
- Enum for tagged unions