Whether the finite current value is strictly below every one of period prior
observations, excluding the current bar. Equality fails. Default propagate
uses prior chronological bars; skip collects prior finite observations.
Missing current values, gaps in required history, and insufficient history
return false. Invalid periods throw RangeError; unknown policies TypeError.
Whether the finite current value is strictly below every one of period prior observations, excluding the current bar. Equality fails. Default
propagateuses prior chronological bars;skipcollects prior finite observations. Missing current values, gaps in required history, and insufficient history return false. Invalid periods throw RangeError; unknown policies TypeError.