History bar field set interface. Returned by the [[getHistory]] method.
open: Rational | null
Open price at the start of the bar.
high: Rational | null
High price in the bar.
low: Rational | null
Low price in the bar.
close: Rational | null
Close price at the end of the bar.
Number of ticks in the bar.
Symbol the response applies to.
Date and time of the start of the period covered by this field set.
Read the dates as localtime, but they are in the timezone for the exchange.
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