Update IsShapeIndep docs

Cargo.toml

@@ -52,7 +52,7 @@ min-cl = { git = "https://github.com/elftausend/min-cl", optional = true }
 
 [features]
 # default = ["cpu", "opencl", "cuda", "blas", "static-api", "stack", "macro", "nnapi", "untyped", "autograd", "autograd", "cached", "lazy", "fork", "graph", "serde"]
-default = ["cpu", "untyped", "lazy", "graph", "opencl", "cuda"]
+default = ["cpu", "untyped", "lazy", "graph", "opencl", "cuda", "cached"]
 # default = [ "cpu", "lazy", "autograd", "graph"]
 # default = ["untyped", "cpu", "lazy", "graph", "autograd", "fork", "serde", "json", "half", "cached", "static-api", "stack", "opencl", ]
 

src/shape.rs

@@ -37,6 +37,8 @@ impl Shape for () {
 }
 
 /// If the [`Shape`] does not matter for a specific device [`Buffer`](crate::Buffer), than this trait should be implemented.
+/// # Safety
+/// The implementor must ensure that created device [`Buffer`](crate::Buffer)s are unaffected by the generic `S` shape parameter.
 pub unsafe trait IsShapeIndep: Device {}
 
 /// If the [`Shape`] is provides a fixed size, than this trait should be implemented.