diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 9aa7efc..6d73779 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -27,10 +27,7 @@ on:
         description: "Choose which toolchain to test (stable, nightly, all)"
         required: true
         type: choice
-        options:
-          - stable
-          - nightly
-          - all
+        options: [stable, nightly, all]
 
 env:
   CARGO_TERM_COLOR: always
@@ -45,12 +42,8 @@ jobs:
         target: [x86_64-unknown-linux-gnu]
         toolchain: [stable]
     steps:
-      - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-          repository: ${{ github.repository }}
-          ref: ${{ github.ref }}
-          token: ${{ github.token }}
+      - name: Checkout
+        uses: actions/checkout@v6
       - name: Setup Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
@@ -61,7 +54,7 @@ jobs:
       - name: Build the workspace
         run: cargo build -r --locked --workspace --features full --target ${{ matrix.target }}
   test:
-    if: (github.event_name == 'workflow_dispatch' && github.event.inputs.toolchain != 'nightly') || true
+    if: github.event_name != 'workflow_dispatch' || github.event.inputs.toolchain != 'nightly'
     needs: build
     runs-on: ubuntu-latest
     strategy:
@@ -70,17 +63,15 @@ jobs:
         features: [full, default]
         target: [x86_64-unknown-linux-gnu]
     steps:
-      - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-          repository: ${{ github.repository }}
-          ref: ${{ github.ref }}
-          token: ${{ github.token }}
+      - name: Checkout
+        uses: actions/checkout@v6
       - name: Setup Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           cache-key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
           target: ${{ matrix.target }}
+          toolchain: stable
+          override: true
       - name: Test (default)
         if: matrix.features == 'default'
         run: cargo test -r --locked --workspace --target ${{ matrix.target}}
@@ -88,8 +79,7 @@ jobs:
         if: matrix.features != 'default'
         run: cargo test -r --locked --workspace --target ${{ matrix.target}} --features ${{ matrix.features }}
   test_nightly:
-    if: (github.event_name == 'workflow_dispatch' && github.event.inputs.toolchain != 'stable') || true
-    continue-on-error: true
+    if: github.event_name != 'workflow_dispatch' || github.event.inputs.toolchain != 'stable'
     needs: build
     runs-on: ubuntu-latest
     strategy:
@@ -99,15 +89,9 @@ jobs:
           - all
           - no_std
           - "alloc,nightly"
-        package:
-          - rspace-traits
     steps:
-      - uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
-          repository: ${{ github.repository }}
-          ref: ${{ github.ref }}
-          token: ${{ github.token }}
+      - name: Checkout
+        uses: actions/checkout@v6
       - name: Setup Rust
         uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
@@ -116,16 +100,16 @@ jobs:
           override: true
       - name: Test (all-features)
         if: matrix.features == 'all'
-        run: cargo test -r --locked --all-features --package ${{ matrix.package }}
+        run: cargo test -r --locked --all-features --workspace
       - name: Test (no_std)
         continue-on-error: true
         if: matrix.features == 'no_std'
-        run: cargo test -r --locked --no-default-features --package ${{ matrix.package }}
+        run: cargo test -r --locked --no-default-features --workspace
         env:
           RUSTFLAGS: "-C panic=abort -Z panic_abort_tests"
       - name: Test (${{ matrix.features }})
         continue-on-error: true
         if: matrix.features != 'all' && matrix.features != 'no_std'
-        run: cargo test -r --locked --no-default-features --features ${{ matrix.features }} --package ${{ matrix.package }}
+        run: cargo test -r --locked --no-default-features --features ${{ matrix.features }} --workspace
         env:
           RUSTFLAGS: "-C panic=abort -Z panic_abort_tests"
diff --git a/Cargo.lock b/Cargo.lock
index 8f2cefa..65d6c53 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -769,7 +769,7 @@ checksum = "7a2d987857b319362043e95f5353c0535c1f58eec5336fdfcf626430af7def58"
 
 [[package]]
 name = "rspace"
-version = "0.0.8"
+version = "0.0.9"
 dependencies = [
  "criterion",
  "rspace-core",
@@ -780,7 +780,7 @@ dependencies = [
 
 [[package]]
 name = "rspace-core"
-version = "0.0.8"
+version = "0.0.9"
 dependencies = [
  "getrandom",
  "hashbrown 0.16.1",
@@ -798,7 +798,7 @@ dependencies = [
 
 [[package]]
 name = "rspace-traits"
-version = "0.0.8"
+version = "0.0.9"
 dependencies = [
  "hashbrown 0.16.1",
  "ndarray",
diff --git a/Cargo.toml b/Cargo.toml
index 2daf505..45f2bb6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,12 +20,12 @@ license = "Apache-2.0"
 readme = "README.md"
 repository = "https://github.com/FL03/rspace.git"
 rust-version = "1.85.0"
-version = "0.0.8"
+version = "0.0.9"
 
 [workspace.dependencies]
-rspace = { default-features = false, path = "rspace", version = "0.0.8" }
-rspace-core = { default-features = false, path = "core", version = "0.0.8" }
-rspace-traits = { default-features = false, path = "traits", version = "0.0.8" }
+rspace = { default-features = false, path = "rspace", version = "0.0.9" }
+rspace-core = { default-features = false, path = "core", version = "0.0.9" }
+rspace-traits = { default-features = false, path = "traits", version = "0.0.9" }
 # development & benchmarking
 criterion = { version = "0.8" }
 # data structures
diff --git a/Clippy.toml b/clippy.toml
similarity index 100%
rename from Clippy.toml
rename to clippy.toml
diff --git a/core/src/lib.rs b/core/src/lib.rs
index 28c6d98..d16cb42 100644
--- a/core/src/lib.rs
+++ b/core/src/lib.rs
@@ -2,7 +2,7 @@
     Appellation: core <library>
     Contrib: FL03 <jo3mccain@icloud.com>
 */
-//! this core components of the contained crate
+//! this modules defines the core pimitives and utilities for `rspace`
 #![allow(
     clippy::missing_safety_doc,
     clippy::module_inception,
@@ -10,12 +10,7 @@
     clippy::upper_case_acronyms
 )]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(feature = "nightly", feature(allocator_api))]
-// compiler checks
-#[cfg(not(any(feature = "std", feature = "alloc")))]
-compile_error! {
-    "Either the 'std' or 'alloc' feature must be enabled."
-}
+#![cfg_attr(all(feature = "alloc", feature = "nightly"), feature(allocator_api))]
 // external crates
 #[cfg(feature = "alloc")]
 extern crate alloc;
diff --git a/default.nix b/default.nix
index 5528100..e716a16 100644
--- a/default.nix
+++ b/default.nix
@@ -26,7 +26,7 @@ let
   };
 
   common = {
-    version = "0.0.8";
+    version = "0.0.9";
     src = self;
 
     cargoLock = {
diff --git a/flake.nix b/flake.nix
index 454b6f1..5c43b26 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,7 +19,7 @@
       in rec {
         packages.default = pkgs.rustPlatform.buildRustPackage {
           pname = "rspace";
-          version = "0.0.8";
+          version = "0.0.9";
           src = self; # ./.;
           cargoLock = {
             lockFile = ./Cargo.lock;
diff --git a/rspace/lib.rs b/rspace/lib.rs
index 3bc43b9..27c72c7 100644
--- a/rspace/lib.rs
+++ b/rspace/lib.rs
@@ -14,11 +14,9 @@
     clippy::upper_case_acronyms
 )]
 #![cfg_attr(not(feature = "std"), no_std)]
-// compiler check
-#[cfg(not(any(feature = "std", feature = "alloc")))]
-compile_error! { "either the \"std\" or \"alloc\" feature must be enabled" }
+#![cfg_attr(all(feature = "alloc", feature = "nightly"), feature(allocator_api))]
 // external crates
-#[cfg(any(feature = "alloc", feature = "std"))]
+#[cfg(feature = "alloc")]
 extern crate alloc;
 // declare external crates as modules
 #[doc(inline)]
diff --git a/traits/src/impls/impl_map.rs b/traits/src/impls/impl_map.rs
index 51810df..94c6241 100644
--- a/traits/src/impls/impl_map.rs
+++ b/traits/src/impls/impl_map.rs
@@ -83,29 +83,30 @@ mod impl_alloc {
     use alloc::alloc::Allocator;
     use alloc::vec::Vec;
 
-    impl<U, V, A, F> MapInto<F, V> for Vec<U, A>
+    impl<F, X, Y, A> MapInto<F, Y> for Vec<X, A>
     where
         A: Allocator,
-        F: FnMut(U) -> V,
-        Vec<V, A>: FromIterator<V>,
+        F: FnMut(X) -> Y,
+        Vec<Y, A>: FromIterator<Y>,
     {
         type Cont<_T> = Vec<_T, A>;
-        type Elem = U;
+        type Elem = X;
 
-        fn apply(self, f: F) -> Self::Cont<V> {
+        fn apply(self, f: F) -> Self::Cont<Y> {
             self.into_iter().map(f).collect()
         }
     }
 
-    impl<'a, U, V, A, F> MapTo<F, V> for &'a Vec<U, A>
+    impl<'a, F, X, Y, A> MapTo<F, Y> for &'a Vec<X, A>
     where
         A: Allocator,
-        F: FnMut(&U) -> V,
+        F: FnMut(&X) -> Y,
+        Vec<Y, A>: FromIterator<Y>,
     {
         type Cont<_T> = Vec<_T, A>;
-        type Elem = &'a U;
+        type Elem = &'a X;
 
-        fn apply(&self, f: F) -> Self::Cont<V> {
+        fn apply(&self, f: F) -> Self::Cont<Y> {
             self.iter().map(f).collect()
         }
     }
@@ -132,6 +133,7 @@ mod impl_alloc {
     impl<'a, U, V, F> MapTo<F, V> for &'a Vec<U>
     where
         F: FnMut(&U) -> V,
+        Vec<V>: FromIterator<V>,
     {
         type Cont<_T> = Vec<_T>;
         type Elem = &'a U;