prepare_Rd: invalid non-character version specification 'x' (type: double)
Calls:
 1: tools:::.check_package_parseRd(".", minlevel = -1)
 2: tryCatch(suppressMessages(checkRd(f, encoding = enc, def_enc = def_enc, macros = macros, stages = c("build", "install", "render"))), error = identity)
 3: tryCatchList(expr, classes, parentenv, handlers)
 4: tryCatchOne(expr, names, parentenv, handlers[[1L]])
 5: doTryCatch(return(expr), name, parentenv, handler)
 6: suppressMessages(checkRd(f, encoding = enc, def_enc = def_enc, macros = macros, stages = c("build", "install", "render")))
 7: withCallingHandlers(expr, message = function(c) if (inherits(c, classes)) tryInvokeRestart("muffleMessage"))
 8: checkRd(f, encoding = enc, def_enc = def_enc, macros = macros, stages = c("build", "install", "render"))
 9: withCallingHandlers({
        prepare_Rd(Rd, defines = defines, stages = stages, warningCalls = FALSE, ..., msglevel = 1)
    }, warning = .whandler)
10: prepare_Rd(Rd, defines = defines, stages = stages, warningCalls = FALSE, ..., msglevel = 1)
11: processRdSexprs(Rd, stage, options, macros = attr(Rd, "macros"))
12: expandDynamicFlags(recurse(block), options)
13: recurse(block)
14: getDynamicFlags(block)
15: recurse(block)
16: recurse(block[[i]])
17: recurse(block[[i]])
18: processRdChunk(block, stage, options, env, macros = macros)
19: evalWithOpt(ce, options, env)
20: tryCatch(withVisible(eval(expr, env)), error = function(e) e)
21: tryCatchList(expr, classes, parentenv, handlers)
22: tryCatchOne(expr, names, parentenv, handlers[[1L]])
23: doTryCatch(return(expr), name, parentenv, handler)
24: withVisible(eval(expr, env))
25: eval(expr, env)
26: eval(expr, env)
27: stevedore:::generate_help()
28: tryCatch(generate_help_string(sub, api_version), error = function(e) "(automatic help generation has failed)")
29: tryCatchList(expr, classes, parentenv, handlers)
30: tryCatchOne(expr, names, parentenv, handlers[[1L]])
31: doTryCatch(return(expr), name, parentenv, handler)
32: generate_help_string(sub, api_version)
33: docker_client(api_version = api_version, http_client_type = "null", quiet = TRUE)
34: docker_api_client(config)
35: docker_api_client_data(self$http_client$api_version, config$quiet)
36: swagger_types(version, spec)
37: swagger_type(t, ret, spec)
38: version_at_least(spec$info$version, info$from)
39: numeric_version(cmp)
40: .make_numeric_version(x, strict, .standard_regexps()$valid_numeric_version)