Lets try matrix this

Author: AffectedArc07

.github/workflows/check.yml

@@ -12,6 +12,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
+        feature_flags: [byond-515-1621, byond-516-1651]
         include:
           - os: ubuntu-latest
             target_name: i686-unknown-linux-gnu
@@ -39,7 +40,7 @@ jobs:
         with:
           toolchain: stable
           command: check
-          args: --target ${{ matrix.target_name }}
+          args: --target ${{ matrix.target_name }} --no-default-features --features ${{ matrix.feature_flags }}
 
   check_fmt:
     name: Check format

crates/byondapi-rs-test/Cargo.toml

@@ -9,7 +9,12 @@ edition = "2021"
 crate-type = ["cdylib"]
 
 [dependencies]
-byondapi = { path = "../byondapi-rs" }
+byondapi = { path = "../byondapi-rs", default-features = false }
 tempfile = "3.17.1"
 cargo_metadata = "0.19.1"
 eyre = "0.6.12"
+
+[features]
+default = ["byond-516-1651"]
+byond-515-1621 = ["byondapi/byond-515-1621",]
+byond-516-1651 = ["byondapi/byond-516-1651"]