In L2/26-070R, variation sequences are formally restricted. The base needs to be gc=L, M, N, P, S, Zs, ccc=0, NFD_QC=Yes, and NFC_QC=Yes. The VS needs to be Variation_Selector=Yes, Default_Ignorable_Code_Point=Yes, and CCC=0. And the sequence itself must be of the length 2.
We need to check these in unicodetools. Considering that Ideographic variation sequences are outside unicodetools, we should check the sequences in StandardizedVariants.txt and emoji-variation-sequences.txt.
In L2/26-070R, variation sequences are formally restricted. The base needs to be gc=L, M, N, P, S, Zs, ccc=0, NFD_QC=Yes, and NFC_QC=Yes. The VS needs to be Variation_Selector=Yes, Default_Ignorable_Code_Point=Yes, and CCC=0. And the sequence itself must be of the length 2.
We need to check these in unicodetools. Considering that Ideographic variation sequences are outside unicodetools, we should check the sequences in StandardizedVariants.txt and emoji-variation-sequences.txt.