Fix certain symbols being incorrectly identified as incomplete boolea… #181

Job	Run time
Setup Build Matrix (false, ion-rust, windows, macos, ubuntu, al2-x86, al2-arm, windows, macos, ub...	1s
Build and Test (windows, default)	1m 32s
Build and Test (windows, all)	1m 33s
Build and Test (windows, experimental-ion-hash)	1m 32s
Build and Test (windows, experimental)	1m 27s
Build and Test (macos, default)	50s
Build and Test (macos, all)	1m 6s
Build and Test (macos, experimental-ion-hash)	54s
Build and Test (macos, experimental)	58s
Build and Test (ubuntu, default)	56s
Build and Test (ubuntu, all)	1m 29s
Build and Test (ubuntu, experimental-ion-hash)	1m 2s
Build and Test (ubuntu, experimental)	1m 6s
Build and Test Confirmation	1s
	14m 27s

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