Allow using IndexMap to preserve fields order

Cargo.toml

@@ -3,7 +3,7 @@ members = [".", "codegen"]
 
 [package]
 name = "rhai"
-version = "1.17.1"
+version = "1.17.2"
 rust-version = "1.66.0"
 edition = "2018"
 resolver = "2"
@@ -25,7 +25,7 @@ num-traits = { version = "0.2.0", default-features = false }
 once_cell = { version = "1.7.0", default-features = false, features = ["race"] }
 bitflags = { version = "2.0.0", default-features = false }
 smartstring = { version = "1.0.0", default-features = false }
-rhai_codegen = { version = "2.0.0", path = "codegen" }
+rhai_codegen = { version = "2.0.0", path = "codegen", package = "rhai_codegen" }
 
 no-std-compat = { git = "https://gitlab.com/jD91mZM2/no-std-compat", version = "0.4.1", default-features = false, features = ["alloc"], optional = true }
 libm = { version = "0.2.0", default-features = false, optional = true }
@@ -39,6 +39,7 @@ getrandom = { version = "0.2.0", optional = true }
 rustyline = { version = "13.0.0", optional = true }
 document-features = { version = "0.2.0", optional = true }
 arbitrary = { version = "1.3.2", optional = true, features = ["derive"] }
+indexmap = { version = "2.2.3", optional = true, features = ["serde"] }
 
 [dev-dependencies]
 rmp-serde = "1.1.0"
@@ -47,14 +48,16 @@ serde_json = { version = "1.0.45", default-features = false, features = ["alloc"
 [features]
 
 ## Default features: `std`, uses runtime random numbers for hashing.
-default = ["std", "ahash/runtime-rng"] # ahash/runtime-rng trumps ahash/compile-time-rng
+default = ["std", "ahash/runtime-rng", "indexmap"] # ahash/runtime-rng trumps ahash/compile-time-rng
 ## Standard features: uses compile-time random number for hashing.
 std = ["once_cell/std", "ahash/std", "num-traits/std", "smartstring/std"]
 
 #! ### Enable Special Functionalities
 
 ## Require that all data types implement `Send + Sync` (for multi-threaded usage).
 sync = []
+## Use IndexMap as Map type
+indexmap = ["dep:indexmap"]
 ## Add support for the [`Decimal`](https://crates.io/crates/rust_decimal) data type (acts as the system floating-point type under `no_float`).
 decimal = ["rust_decimal"]
 ## Enable serialization/deserialization of Rhai data types via [`serde`](https://crates.io/crates/serde).
@@ -141,14 +144,6 @@ name = "rhai-run"
 name = "rhai-dbg"
 required-features = ["debugging"]
 
-[[example]]
-name = "serde"
-required-features = ["serde"]
-
-[[example]]
-name = "definitions"
-required-features = ["metadata", "internals"]
-
 [profile.release]
 lto = "fat"
 codegen-units = 1

codegen/Cargo.toml

@@ -24,5 +24,5 @@ syn = { version = "2.0.0", features = ["full", "parsing", "printing", "proc-macr
 quote = "1.0.0"
 
 [dev-dependencies]
-rhai = { path = "..", version = "1.17.0", features = ["metadata"] }
+rhai = { path = "..", features = ["metadata"], package = "rhai" }
 trybuild = "1.0.0"