paste and paste0 use as.character internally

...in/src/com/oracle/truffle/r/nodes/builtin/base/Paste.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Paste0.java

...com/oracle/truffle/r/nodes/builtin/base/SeqFunctions.java

...om/oracle/truffle/r/nodes/builtin/casts/PipelineStep.java

...r/nodes/function/call/RExplicitBaseEnvCallDispatcher.java

...acle/truffle/r/nodes/function/call/RExplicitCallNode.java

...le.r.runtime/src/com/oracle/truffle/r/runtime/RError.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...com/oracle/truffle/r/test/builtins/TestBuiltin_paste.java