wheat <- read_apsimx(system.file("extdata/Wheat.json", package = "rapsimng"))
a <- search_path(wheat, '[Wheat].Phenology.ThermalTime')
a$node$Children[[1]]$X[[2]] <- 27
wheat_new <- replace_model(wheat, a$path, a$node)
b <- search_path(wheat_new, '[Wheat].Phenology.ThermalTime')
b$node$Children[[1]]$X
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