What fraction of the candle's range did its real body capture, with sign? Walk the evidence clock one stage at a time. This lab teaches the publication contract; it does not simulate returns, platform parity, or trade performance.
Selected expression
BOP=(C-O)/(H-L), with explicit zero-range handling
Availability rule
An output at t may use only finite, basis-consistent observations available through t; chart alignment never moves the information clock backward.
calculated · step 1 of 7
Verified synthetic fixture
This lab is paired with datasets/implementation-fixtures.json: 96 deterministic, oldest-to-newest observations spanning oscillating, rising, and moderating regimes. It is teaching data—not market history or predictive evidence.
Canonical latest output (D07-F03-A27)
{
"value": -0.11921211954649767
}
Executable checks cover this result, flat/zero-volume boundaries, invalid timestamps, and prefix causality in both language entry points.