build_url_query_string()
""
build_url_query_string(field1 = "option1")
"?field1=option1"
build_url_query_string(field1 = "option1", field2 = 42, field3 = c(1, 2, 3))
"?field1=option1&field2=42&field3=1,2,3"
build_url_query_string(prefix = "/query?", sep = "|", value_sep = ":",
field1 = 1, field2 = c(7, 8, 9))
"/query?field1=1|field2=7:8:9"
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