> EDIT: Ok, so I installed perl6 (rakudo) just to test this out, and it apparently doesn't work out of the box. Pity.

By any chance, was it from system packages that are likely outdated? You can get up-to-date packages [here](https://github.com/nxadm/rakudo-pkg/releases) or for Windows/Mac, use [Rakudo Star](http://rakudo.org/downloads/star/). Anything older than 2017.04 is ancient and anything older than 2015.12 precedes first stable release and is likely broken.

> Now I wonder what other number systems it supports

It goes by Unicode's definition of what's a digit or a number (using Nd and No) properties. Nd chars are "digits" and can be combined. `No` chars are "Numeric other" and can't be combined; can only use them as numeric literals. [Among other things](https://docs.perl6.org/language/unicode_texas.html#Numeric_c...), that includes Unicodey fractions. And as a cherry on top, you can use superscript chars to raise to a power:

$ rakudo -e 'say ½ + 42²'
1764.5

Here are all the Nd and No chars that can be used as numeric literals:

$ rakudo -e 'put (^0x110000).grep(*.uniprop eq any <Nd No>)».chr'
0 1 2 3 4 5 6 7 8 9 ² ³ ¹ ¼ ½ ¾ ٠ ١ ٢ ٣ ٤ ٥ ٦ ٧ ٨ ٩ ۰ ۱ ۲ ۳ ۴ ۵ ۶ ۷ ۸ ۹ ߀ ߁
߂ ߃ ߄ ߅ ߆ ߇ ߈ ߉ ० १ २ ३ ४ ५ ६ ७ ८ ९ ০ ১ ২ ৩ ৪ ৫ ৬ ৭ ৮ ৯ ৴ ৵ ৶ ৷ ৸ ৹ ੦ ੧ ੨ ੩
੪ ੫ ੬ ੭ ੮ ੯ ૦ ૧ ૨ ૩ ૪ ૫ ૬ ૭ ૮ ૯ ୦ ୧ ୨ ୩ ୪ ୫ ୬ ୭ ୮ ୯ ୲ ୳ ୴
୵ ୶ ୷ ௦ ௧ ௨ ௩ ௪ ௫ ௬ ௭ ௮ ௯ ௰ ௱ ௲ ౦ ౧ ౨ ౩ ౪ ౫ ౬ ౭ ౮ ౯ ౸
౹ ౺ ౻ ౼ ౽ ౾ ೦ ೧ ೨ ೩ ೪ ೫ ೬ ೭ ೮ ೯ ൘ ൙ ൚ ൛ ൜ ൝ ൞ ൦ ൧ ൨ ൩ ൪
൫ ൬ ൭ ൮ ൯ ൰ ൱ ൲ ൳ ൴ ൵ ൶ ൷ ൸ ෦ ෧ ෨ ෩ ෪ ෫ ෬ ෭ ෮ ෯ ๐ ๑ ๒ ๓ ๔ ๕
๖ ๗ ๘ ๙ ໐ ໑ ໒ ໓ ໔ ໕ ໖ ໗ ໘ ໙ ༠ ༡ ༢ ༣ ༤ ༥ ༦ ༧ ༨ ༩ ༪ ༫ ༬ ༭ ༮ ༯ ༰
༱ ༲ ༳ ၀ ၁ ၂ ၃ ၄ ၅ ၆ ၇ ၈ ၉ ႐ ႑ ႒ ႓ ႔ ႕ ႖ ႗ ႘ ႙ ፩ ፪ ፫ ፬ ፭
፮ ፯ ፰ ፱ ፲ ፳ ፴ ፵ ፶ ፷ ፸ ፹ ፺ ፻ ፼ ០ ១ ២ ៣ ៤ ៥ ៦ ៧ ៨ ៩ ៰ ៱ ៲
៳ ៴ ៵ ៶ ៷ ៸ ៹ ᠐ ᠑ ᠒ ᠓ ᠔ ᠕ ᠖ ᠗ ᠘ ᠙ ᥆ ᥇ ᥈ ᥉ ᥊ ᥋ ᥌ ᥍ ᥎ ᥏ ᧐ ᧑
᧒ ᧓ ᧔ ᧕ ᧖ ᧗ ᧘ ᧙ ᧚ ᪀ ᪁ ᪂ ᪃ ᪄ ᪅ ᪆ ᪇ ᪈ ᪉ ᪐ ᪑ ᪒ ᪓ ᪔ ᪕ ᪖ ᪗
᪘ ᪙ ᭐ ᭑ ᭒ ᭓ ᭔ ᭕ ᭖ ᭗ ᭘ ᭙ ᮰ ᮱ ᮲ ᮳ ᮴ ᮵ ᮶ ᮷ ᮸ ᮹ ᱀ ᱁ ᱂ ᱃ ᱄
᱅ ᱆ ᱇ ᱈ ᱉ ᱐ ᱑ ᱒ ᱓ ᱔ ᱕ ᱖ ᱗ ᱘ ᱙ ⁰ ⁴ ⁵ ⁶ ⁷ ⁸ ⁹ ₀ ₁ ₂ ₃ ₄ ₅ ₆ ₇ ₈ ₉ ⅐ ⅑
⅒ ⅓ ⅔ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞ ⅟ ↉ ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮
⑯ ⑰ ⑱ ⑲ ⑳ ⑴ ⑵ ⑶ ⑷ ⑸ ⑹ ⑺ ⑻ ⑼ ⑽ ⑾ ⑿ ⒀ ⒁ ⒂ ⒃ ⒄ ⒅ ⒆ ⒇ ⒈ ⒉
⒊ ⒋ ⒌ ⒍ ⒎ ⒏ ⒐ ⒑ ⒒ ⒓ ⒔ ⒕ ⒖ ⒗ ⒘ ⒙ ⒚ ⒛ ⓪ ⓫ ⓬ ⓭ ⓮ ⓯ ⓰ ⓱ ⓲
⓳ ⓴ ⓵ ⓶ ⓷ ⓸ ⓹ ⓺ ⓻ ⓼ ⓽ ⓾ ⓿
⳽ ㆒ ㆓ ㆔ ㆕ ㈠ ㈡ ㈢ ㈣ ㈤ ㈥ ㈦ ㈧ ㈨
㈩ ㉈ ㉉ ㉊ ㉋ ㉌ ㉍ ㉎ ㉏ ㉑ ㉒ ㉓ ㉔ ㉕ ㉖ ㉗ ㉘ ㉙ ㉚ ㉛ ㉜ ㉝ ㉞ ㉟ ㊀ ㊁ ㊂
㊃ ㊄ ㊅ ㊆ ㊇ ㊈ ㊉ ㊱ ㊲ ㊳ ㊴ ㊵ ㊶ ㊷ ㊸ ㊹ ㊺ ㊻ ㊼ ㊽ ㊾ ㊿ ꘠ ꘡ ꘢ ꘣ ꘤ ꘥
꘦ ꘧ ꘨ ꘩ ꠰ ꠱ ꠲ ꠳ ꠴ ꠵ ꣐ ꣑ ꣒ ꣓ ꣔ ꣕ ꣖ ꣗ ꣘ ꣙ ꤀ ꤁ ꤂ ꤃ ꤄ ꤅ ꤆
꤇ ꤈ ꤉ ꧐ ꧑ ꧒ ꧓ ꧔ ꧕ ꧖ ꧗ ꧘ ꧙ ꧰ ꧱ ꧲ ꧳ ꧴ ꧵ ꧶ ꧷ ꧸ ꧹ ꩐ ꩑ ꩒
꩓ ꩔ ꩕ ꩖ ꩗ ꩘ ꩙ ꯰ ꯱ ꯲ ꯳ ꯴ ꯵ ꯶ ꯷ ꯸ ꯹ ０ １ ２ ３ ４ ５ ６ ７ ８
９ 𐄇 𐄈 𐄉 𐄊 𐄋 𐄌 𐄍 𐄎 𐄏 𐄐 𐄑 𐄒 𐄓 𐄔 𐄕 𐄖 𐄗 𐄘 𐄙 𐄚 𐄛 𐄜 𐄝 𐄞 𐄟 𐄠 𐄡 𐄢 𐄣 𐄤 𐄥 𐄦 𐄧
𐄨 𐄩 𐄪 𐄫 𐄬 𐄭 𐄮 𐄯 𐄰 𐄱 𐄲 𐄳 𐅵 𐅶 𐅷 𐅸 𐆊 𐆋 𐋡 𐋢 𐋣 𐋤 𐋥 𐋦 𐋧 𐋨 𐋩 𐋪 𐋫 𐋬 𐋭 𐋮 𐋯 𐋰 𐋱
𐋲 𐋳 𐋴 𐋵 𐋶 𐋷 𐋸 𐋹 𐋺 𐋻 𐌠 𐌡 𐌢 𐌣 𐒠 𐒡 𐒢 𐒣 𐒤 𐒥 𐒦 𐒧 𐒨 𐒩 𐡘 𐡙 𐡚 𐡛 𐡜 𐡝 𐡞 𐡟 𐡹 𐡺 𐡻
𐡼 𐡽 𐡾 𐡿 𐢧 𐢨 𐢩 𐢪 𐢫 𐢬 𐢭 𐢮 𐢯 𐣻 𐣼 𐣽 𐣾 𐣿 𐤖 𐤗 𐤘 𐤙 𐤚 𐤛 𐦼 𐦽 𐧀 𐧁 𐧂 𐧃 𐧄 𐧅 𐧆 𐧇 𐧈 𐧉
𐧊 𐧋 𐧌 𐧍 𐧎 𐧏 𐧒 𐧓 𐧔 𐧕 𐧖 𐧗 𐧘 𐧙 𐧚 𐧛 𐧜 𐧝 𐧞 𐧟 𐧠 𐧡 𐧢 𐧣 𐧤 𐧥 𐧦 𐧧 𐧨 𐧩 𐧪 𐧫 𐧬 𐧭 𐧮
𐧯 𐧰 𐧱 𐧲 𐧳 𐧴 𐧵 𐧶 𐧷 𐧸 𐧹 𐧺 𐧻 𐧼 𐧽 𐧾 𐧿 𐩀 𐩁 𐩂 𐩃 𐩄 𐩅 𐩆 𐩇 𐩽 𐩾 𐪝 𐪞 𐪟 𐫫 𐫬 𐫭 𐫮 𐫯
𐭘 𐭙 𐭚 𐭛 𐭜 𐭝 𐭞 𐭟 𐭸 𐭹 𐭺 𐭻 𐭼 𐭽 𐭾 𐭿 𐮩 𐮪 𐮫 𐮬 𐮭 𐮮 𐮯 𐳺 𐳻 𐳼 𐳽 𐳾 𐳿 𐹠 𐹡 𐹢 𐹣 𐹤 𐹥
𐹦 𐹧 𐹨 𐹩 𐹪 𐹫 𐹬 𐹭 𐹮 𐹯 𐹰 𐹱 𐹲 𐹳 𐹴 𐹵 𐹶 𐹷 𐹸 𐹹 𐹺 𐹻 𐹼 𐹽 𐹾 𑁒 𑁓 𑁔 𑁕 𑁖 𑁗 𑁘 𑁙 𑁚 𑁛
𑁜 𑁝 𑁞 𑁟 𑁠 𑁡 𑁢 𑁣 𑁤 𑁥 𑁦 𑁧 𑁨 𑁩 𑁪 𑁫 𑁬 𑁭 𑁮 𑁯 𑃰 𑃱 𑃲 𑃳 𑃴 𑃵 𑃶 𑃷 𑃸 𑃹 𑄶 𑄷 𑄸 𑄹 𑄺
𑄻 𑄼 𑄽 𑄾 𑄿 𑇐 𑇑 𑇒 𑇓 𑇔 𑇕 𑇖 𑇗 𑇘 𑇙 𑇡 𑇢 𑇣 𑇤 𑇥 𑇦 𑇧 𑇨 𑇩 𑇪 𑇫 𑇬 𑇭 𑇮 𑇯 𑇰 𑇱 𑇲 𑇳 𑇴
𑋰 𑋱 𑋲 𑋳 𑋴 𑋵 𑋶 𑋷 𑋸 𑋹 𑑐 𑑑 𑑒 𑑓 𑑔 𑑕 𑑖 𑑗 𑑘 𑑙 𑓐 𑓑 𑓒 𑓓 𑓔 𑓕 𑓖 𑓗 𑓘 𑓙 𑙐 𑙑 𑙒 𑙓 𑙔
𑙕 𑙖 𑙗 𑙘 𑙙 𑛀 𑛁 𑛂 𑛃 𑛄 𑛅 𑛆 𑛇 𑛈 𑛉 𑜰 𑜱 𑜲 𑜳 𑜴 𑜵 𑜶 𑜷 𑜸 𑜹 𑜺 𑜻 𑣠 𑣡 𑣢 𑣣 𑣤 𑣥 𑣦 𑣧
𑣨 𑣩 𑣪 𑣫 𑣬 𑣭 𑣮 𑣯 𑣰 𑣱 𑣲 𑱐 𑱑 𑱒 𑱓 𑱔 𑱕 𑱖 𑱗 𑱘 𑱙 𑱚 𑱛 𑱜 𑱝 𑱞 𑱟 𑱠 𑱡 𑱢 𑱣 𑱤 𑱥 𑱦 𑱧
𑱨 𑱩 𑱪 𑱫 𑱬 𖩠 𖩡 𖩢 𖩣 𖩤 𖩥 𖩦 𖩧 𖩨 𖩩 𖭐 𖭑 𖭒 𖭓 𖭔 𖭕 𖭖 𖭗 𖭘 𖭙 𖭛 𖭜 𖭝 𖭞 𖭟 𖭠 𖭡 𝍠 𝍡 𝍢
𝍣 𝍤 𝍥 𝍦 𝍧 𝍨 𝍩 𝍪 𝍫 𝍬 𝍭 𝍮 𝍯 𝍰 𝍱 𝟎 𝟏 𝟐 𝟑 𝟒 𝟓 𝟔 𝟕 𝟖 𝟗 𝟘 𝟙 𝟚 𝟛 𝟜 𝟝 𝟞 𝟟 𝟠 𝟡 𝟢
𝟣 𝟤 𝟥 𝟦 𝟧 𝟨 𝟩 𝟪 𝟫 𝟬 𝟭 𝟮 𝟯 𝟰 𝟱 𝟲 𝟳 𝟴 𝟵 𝟶 𝟷 𝟸 𝟹 𝟺 𝟻 𝟼 𝟽 𝟾 𝟿 𞣇 𞣈 𞣉 𞣊 𞣋
𞣌 𞣍 𞣎 𞣏 𞥐 𞥑 𞥒 𞥓 𞥔 𞥕 𞥖 𞥗 𞥘 𞥙 🄀 🄁 🄂 🄃 🄄 🄅 🄆 🄇 🄈 🄉 🄊 🄋 🄌