I figured it out: attribute is called "dimnames" not ".Dimnames".
> .Internal(inspect(rmat))
@34d39b0 10 LGLSXP g0c2 [MARK,NAM(2),ATT] (len=4, tl=0) 1,1,0,0
ATTRIB:
@32b8228 02 LISTSXP g0c0 [MARK]
TAG: @e83798 01 SYMSXP g1c0 [MARK,LCK,gp=0x4000] "dim" (has value)
@33d78c8 13 INTSXP g0c1 [MARK,NAM(2)] (len=2, tl=0) 2,2
TAG: @e83808 01 SYMSXP g1c0 [MARK,LCK,gp=0x4000] "dimnames" (has value)
@34d3978 19 VECSXP g0c2 [MARK,NAM(2)] (len=2, tl=0)
@34d3a20 16 STRSXP g0c2 [MARK,NAM(2)] (len=2, tl=0)
@103d408 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "a"
@1217678 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "b"
@e83b18 00 NILSXP g1c0 [MARK,NAM(2)]
> .Internal(inspect(rcpp_mat))
@34f5f80 10 LGLSXP g0c2 [MARK,NAM(2),ATT] (len=4, tl=0) 1,1,0,0
ATTRIB:
@32b9100 02 LISTSXP g0c0 [MARK]
TAG: @e83798 01 SYMSXP g1c0 [MARK,LCK,gp=0x4000] "dim" (has value)
@33d76e8 13 INTSXP g0c1 [MARK,NAM(2)] (len=2, tl=0) 2,2
TAG: @1ab0878 01 SYMSXP g0c0 [MARK] ".Dimnames"
@34f5f48 19 VECSXP g0c2 [MARK] (len=2, tl=0)
@34f5f10 16 STRSXP g0c2 [MARK] (len=2, tl=0)
@103d408 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "a"
@1217678 09 CHARSXP g1c1 [MARK,gp=0x61] [ASCII] [cached] "b"
@e83b18 00 NILSXP g1c0 [MARK,NAM(2)]
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