Fix ATAN.ERROR.5 #1421

Job	Run time
clasp/macos-13/bytecode-faso/no	56m 56s
clasp/macos-13/bytecode-faso/no	56m 56s
clasp/macos-13/bytecode/yes	50m 10s
clasp/macos-13/bytecode/yes	50m 10s
clasp/macos-14/bytecode/no	20m 30s
clasp/macos-14/bytecode/no	20m 30s
clasp/ubuntu-latest/faso/no	30m 57s
clasp/ubuntu-latest/faso/no	30m 57s
clasp/ubuntu-latest/bytecode-faso/no	31m 25s
clasp/ubuntu-latest/bytecode-faso/no	31m 25s
clasp/ubuntu-latest/bytecode/no	25m 47s
clasp/ubuntu-latest/bytecode/no	25m 47s
clasp/ubuntu-latest/bytecode/yes	18m 30s
clasp/ubuntu-latest/bytecode/yes	6h 0m 14s
cando/macos-13/bytecode-faso/no	1h 15m 52s
cando/macos-13/bytecode-faso/no	1h 15m 52s
cando/ubuntu-latest/bytecode-faso/no	44m 36s
cando/ubuntu-latest/bytecode-faso/no	44m 36s
	17h 31m 10s

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