The strings were extracted with: strings libnickel.so.1.0.0 | grep -E ........ | sort > libnickel.strings
The symbols were extracted with: arm-linux-gnueabi-objdump -d -S libnickel.so.1.0.0 | grep ZN | cut -d ' ' -f 2 | sort | sed '/^$/d' | c++filt > libnickel.syms

For comparing the two, I recommend using VSCode.