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Document operator reference

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doc/manual/souce/language/operators.md
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この章では、Decodal の演算子の意味を定義する。
## 演算子一覧
| 演算子 | 形 | 種類 | 対象 | 結果 / 意味 |
|---|---|---|---|---|
| `.` | `object.field` | field reference | object / abstract object | field value |
| call | `fn(arg)` | function call | function | function result |
| `!` | `!expr` | unary logical | concrete `Bool` | concrete `Bool` |
| `-` | `-expr` | unary arithmetic | concrete `Int` / `Float` | negated number |
| `*` | `lhs * rhs` | arithmetic | concrete `Int` / `Float` | numeric product |
| `/` | `lhs / rhs` | arithmetic | concrete `Int` / `Float` | `Float` quotient |
| `+` | `lhs + rhs` | arithmetic | concrete `Int` / `Float` | numeric sum |
| `-` | `lhs - rhs` | arithmetic | concrete `Int` / `Float` | numeric difference |
| `==` | `lhs == rhs` | equality | concrete scalar | concrete `Bool` |
| `!=` | `lhs != rhs` | equality | concrete scalar | concrete `Bool` |
| `<` | `lhs < rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
| `<=` | `lhs <= rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
| `>` | `lhs > rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
| `>=` | `lhs >= rhs` | ordering | concrete `Int` / `Float` | concrete `Bool` |
| `>` | `> value` | comparison constraint | numeric constraint value | abstract constraint |
| `>=` | `>= value` | comparison constraint | numeric constraint value | abstract constraint |
| `<` | `< value` | comparison constraint | numeric constraint value | abstract constraint |
| `<=` | `<= value` | comparison constraint | numeric constraint value | abstract constraint |
| `&&` | `lhs && rhs` | logical | concrete `Bool` | short-circuit AND |
| `||` | `lhs || rhs` | logical | concrete `Bool` | short-circuit OR |
| `&` | `lhs & rhs` | composition | value / constraint / object | constraint-preserving composition |
| `//` | `lhs // rhs` | patch | object / value | right-biased structural patch |
| `default` | `base default fallback` | default | abstract value | materialization fallback |
`concrete scalar` は `String`、`Bool`、`Int`、`Float` を指す。
`++` による array concat は未導入である。
## 優先順位
優先順位は高い順に以下である。