Constant KV_BINDING_NAME 

pub const KV_BINDING_NAME: &'static str;

The bare Kv’s binding (KV), re-exported for bynk deploy, which reads generated configs and tells the bare namespace from derived instances by it (S4b, #1967). The fixed Worker binding name for the Kv namespace (decision C1, v0.19): one namespace, one [[kv_namespaces]] stanza, one env.KV field.