fix selecting nested field with name that begins with dollar sign (#108) #130

Job	Run time
deploy::binary	3m 31s
connector-definition	0s
build the CLI binaries (ubuntu-latest, x86_64-unknown-linux-musl, -C target-feature=+crt-static, ...	1m 9s
build the CLI binaries (ubuntu-latest, aarch64-unknown-linux-musl, -C target-feature=+crt-static,...	1m 30s
build the CLI binaries (macos-latest, x86_64-apple-darwin)	1m 11s
build the CLI binaries (macos-latest, aarch64-apple-darwin)	1m 4s
build the CLI binaries (windows-latest, x86_64-pc-windows-msvc, -C target-feature=+crt-static, .exe)	3m 35s
deploy::docker	3m 58s
release to GitHub	0s
	15m 58s

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