Bug: UseMethod("collector_value") error in update_intervar.R

[rjcorb]

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2026-08-14T13:37:59.268915619Z Error in UseMethod("collector_value") : 
2026-08-14T13:37:59.268965112Z   no applicable method for 'collector_value' applied to an object of class "c('collector_skip', 'collector')"
2026-08-14T13:37:59.268970963Z Calls: <Anonymous> -> collector_value
2026-08-14T13:37:59.268975317Z Execution halted

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