Function normalize_and_validate_canonical_sequence 

pub fn normalize_and_validate_canonical_sequence<N: Network>(
    state: &CanonicalSequenceState,
    batch: &ReactiveInputBatch<N>,
) -> Result<CanonicalSequenceValidation, ReactiveError>

Validate a composite-source envelope and normalize harmless coverage overlap.

This has the same fail-closed rollback/finality/identity contract as validate_canonical_sequence. In addition, an equal or older ChainControl::CanonicalProgress whose exact compatible identity is retained is omitted from CanonicalSequenceValidation::normalized_chain_controls. A compatible stale blockful ChainControl::Barrier is retained with the same opaque id and block: None, preserving the synchronization event without forwarding regressive coverage. An equal-height control that fills absent parent/timestamp metadata is retained and applied. Older compatible metadata enrichment is deliberately dropped together with its non-forwarded control so the returned state remains identical to what the runtime will observe. Unknown or conflicting stale identities remain errors.

Errors

Returns ReactiveError::InvalidInputRecord for malformed or conflicting record identity/payload metadata, and ReactiveError::InvalidChainControl when canonical overlap cannot be proven redundant or when rollback, adjacency, identity, coverage, or finality validation fails.