tubedude / finance-elixir / 4c2ee0380c0ab7040d4758926391f0fe45f24a40

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Scan the bracket interior so even-crossing series find a root (#24)

Bracketing compared only the two ends of the rate domain, so a series with
more than one IRR — where both ends share a sign — reported did_not_converge
even though a real rate existed (numpy-financial #39). The bracket now scans
the interior on a geometric grid and returns the sign-change interval nearest
:guess, so a multi-IRR series resolves to the rate a guess-driven spreadsheet
XIRR returns. Both solvers share the bracket. Single-rate series are unchanged.

Ships under 1.6.0 alongside Finance.Solver.Brent.


Claude-Session: https://claude.ai/code/session_01AVibXT2w1dEdVtMHqffFKn

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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435 of 435 relevant lines covered (100.0%)

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