readTopology with negative edge lengths

[fogg-uw]

not sure if this is a bug or a feature, but PhyloNetworks.readTopology seems not to like negative edge lengths.

input

readTopology("((A:1,B:1):-1,C:2);")

gives output

┌ Warning: one colon read without double in left parenthesis 2, ignored.
└ @ PhyloNetworks ~/.julia/packages/PhyloNetworks/Wtq8B/src/readwrite.jl:270
HybridNetwork, Rooted Network
5 edges
6 nodes: 4 tips, 0 hybrid nodes, 2 internal tree nodes.
tip labels: A, B, 1, C
((A:1.0,B:1.0),1,C:2.0);

and input

readTopology("((A:1,B:-1):1,C:2);")

gives output

┌ Warning: one colon read without double in left parenthesis 2, ignored.
└ @ PhyloNetworks ~/.julia/packages/PhyloNetworks/Wtq8B/src/readwrite.jl:270
ERROR: Expected right parenthesis after left parenthesis 2 but read -. The remainder of line is 1):1,C:2);.