extractUsageFromResponse() and normalizeUsage() used Number(x)
coercion for cost_in_usd_ticks, which silently turned null/""
into 0 -- accepted downstream as a valid $0 exact cost instead of
falling back to the token-based estimate. Both call sites now
require typeof === "number" && Number.isFinite && >= 0.
Rebased onto current release/v3.8.47 tip (already carries #6711)
and trimmed to just the incremental validation fix + 2 regression
tests, replacing the stale-base diff that re-added the whole
already-merged feature.
Co-authored-by: KooshaPari <koosha@phenotype.io>
Co-authored-by: diegosouzapw <8016841+diegosouzapw@users.noreply.github.com>
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