.robustDigest(env) that contains a `lme4` generated object corrupts the original `lme4` object

[tati-micheletti]

This does not happen to stats::lm.

Reprex on Cache + env + glmer problem

env <- new.env()
dt <- data.frame(a = c(1, 5, 10),
b = c(2, 3, 7),
re = c(1, 1, 3))
modGlmer <- list(MOD1 = lme4::glmer(formula = a ~ b + (1|re), data = dt, family = "poisson"))
modLmer <- list(MOD2 = lme4::lmer(formula = a ~ b + (1|re), data = dt))
modLm <- list(MOD3 = stats::lm(formula = a ~ b, data = dt))

assign(x = "modGlmer",
value = modGlmer,
envir = env)
assign(x = "modLmer",
value = modLmer,
envir = env)
assign(x = "modLm",
value = modLm,
envir = env)

tryCatch(print(modGlmer), error = function(e)
message("Original object modGlmer was modified by reproducible:::.robustDigest and returns error"))
tryCatch(print(modLmer), error = function(e)
message("Original object modLmer was modified by reproducible:::.robustDigest and returns error"))
tryCatch(print(modLm), error = function(e)
message("Original object modLm was modified by reproducible:::.robustDigest and returns error"))

reproducible:::.robustDigest(env)

tryCatch(print(modGlmer), error = function(e)
message("Original object modGlmer was modified by reproducible:::.robustDigest and returns error"))
tryCatch(print(modLmer), error = function(e)
message("Original object modLmer was modified by reproducible:::.robustDigest and returns error"))
tryCatch(print(modLm), error = function(e)
message("Original object modLm was modified by reproducible:::.robustDigest and returns error"))

[achubaty]

@tati-micheletti can you please confirm that Eliot's fix solves the problem? thanks.