visualization fails when variables contain "<" and ">" chars

[ami-navon]

from lolviz import objviz
a={"hello":"<"}
objviz(a).render()
Error: Source.gv: syntax error in line 16 scanning a HTML string (missing '>'? bad nesting? longer than 16384?)
String starting:<

[parrt]

oh interesting. thanks!

[jabowery]

graphviz.backend.execute.CalledProcessError: Command '[PosixPath('dot'), '-Kdot', '-Tpdf', '-O', 'Source.gv']' returned non-zero exit status 1. [stderr: b"Error: not well-formed (invalid token) in line 2 \n... (<class 'sksequitur.core.Symbol'> ...\n"]