ISO-8601 period string — YYYY (annual), YYYY-QN (quarterly), YYYY-MM (monthly).
Primary year component of the period (convenience for sorting).
Numeric value of the observation, or null when the cell is empty/suppressed.
Whether the observation is an IMF forecast/projection rather than a published actual.
A single observation (one time-period, one value) in an IMF series.
isForecastistruewhen the period is beyond the IMF's most recent published actual for that series — relevant mainly for WEO projections (spring 2026 release carries actuals through 2025 and forecasts for 2026-2030 for most series). Callers should surface this flag in the UI so readers can distinguish actuals from projections.